51131260651 has 16 divisors (see below), whose sum is σ = 53934219360. Its totient is φ = 48399070720.

The previous prime is 51131260603. The next prime is 51131260669. The reversal of 51131260651 is 15606213115.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51131260651 is a prime.

It is a super-2 number, since 2×51131260651² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51131260681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2079636 + ... + 2104078.

It is an arithmetic number, because the mean of its divisors is an integer number (3370888710).

Almost surely, 2^51131260651 is an apocalyptic number.

51131260651 is a deficient number, since it is larger than the sum of its proper divisors (2802958709).

51131260651 is a wasteful number, since it uses less digits than its factorization.

51131260651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25886.

The product of its (nonzero) digits is 5400, while the sum is 31.

Adding to 51131260651 its reverse (15606213115), we get a palindrome (66737473766).

The spelling of 51131260651 in words is "fifty-one billion, one hundred thirty-one million, two hundred sixty thousand, six hundred fifty-one".