2151231534 has 20 divisors (see below), whose sum is σ = 4820352504. Its totient is φ = 717077124.

The previous prime is 2151231499. The next prime is 2151231539. The reversal of 2151231534 is 4351321512.

2151231534 is a `hidden beast` number, since 2 + 1 + 5 + 123 + 1 + 534 = 666.

It is a super-2 number, since 2×2151231534² = 9255594225751986312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2151231498 and 2151231507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151231539) 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 9 ways as a sum of consecutive naturals, for example, 6639442 + ... + 6639765.

Almost surely, 2^2151231534 is an apocalyptic number.

2151231534 is an abundant number, since it is smaller than the sum of its proper divisors (2669120970).

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

2151231534 is a wasteful number, since it uses less digits than its factorization.

2151231534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13279221 (or 13279212 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 2151231534 is about 46381.3705489607. The cubic root of 2151231534 is about 1290.9092670036.

The spelling of 2151231534 in words is "two billion, one hundred fifty-one million, two hundred thirty-one thousand, five hundred thirty-four".