2131451340 has 48 divisors (see below), whose sum is σ = 5983014240. Its totient is φ = 566963200.

The previous prime is 2131451327. The next prime is 2131451383. The reversal of 2131451340 is 431541312.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2131451340.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20235 + ... + 68354.

It is an arithmetic number, because the mean of its divisors is an integer number (124646130).

Almost surely, 2^2131451340 is an apocalyptic number.

2131451340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2131451340 is an abundant number, since it is smaller than the sum of its proper divisors (3851562900).

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

2131451340 is a wasteful number, since it uses less digits than its factorization.

2131451340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89002 (or 89000 counting only the distinct ones).

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

The square root of 2131451340 is about 46167.6438645075. The cubic root of 2131451340 is about 1286.9405171471.

Adding to 2131451340 its reverse (431541312), we get a palindrome (2562992652).

The spelling of 2131451340 in words is "two billion, one hundred thirty-one million, four hundred fifty-one thousand, three hundred forty".