2151431304 has 96 divisors (see below), whose sum is σ = 6072077760. Its totient is φ = 634296960.

The previous prime is 2151431299. The next prime is 2151431309. The reversal of 2151431304 is 4031341512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2151431299) and next prime (2151431309).

It is a super-2 number, since 2×2151431304² = 9257313311662280832, which contains 22 as substring.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (2151431309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 97437 + ... + 117459.

It is an arithmetic number, because the mean of its divisors is an integer number (63250810).

Almost surely, 2^2151431304 is an apocalyptic number.

2151431304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2151431304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3036038880).

2151431304 is an abundant number, since it is smaller than the sum of its proper divisors (3920646456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2151431304 is a wasteful number, since it uses less digits than its factorization.

2151431304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20091 (or 20076 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 2151431304 is about 46383.5240575789. The cubic root of 2151431304 is about 1290.9492250397.

Adding to 2151431304 its reverse (4031341512), we get a palindrome (6182772816).

The spelling of 2151431304 in words is "two billion, one hundred fifty-one million, four hundred thirty-one thousand, three hundred four".