51527611631 has 4 divisors (see below), whose sum is σ = 51528231552. Its totient is φ = 51526991712.

The previous prime is 51527611613. The next prime is 51527611649. The reversal of 51527611631 is 13611672515.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (51527611613) and next prime (51527611649).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51527611631 is a prime.

It is a super-2 number, since 2×51527611631² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51527611601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161615 + ... + 359408.

It is an arithmetic number, because the mean of its divisors is an integer number (12882057888).

Almost surely, 2^51527611631 is an apocalyptic number.

51527611631 is a deficient number, since it is larger than the sum of its proper divisors (619921).

51527611631 is an equidigital number, since it uses as much as digits as its factorization.

51527611631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619920.

The product of its digits is 37800, while the sum is 38.

The spelling of 51527611631 in words is "fifty-one billion, five hundred twenty-seven million, six hundred eleven thousand, six hundred thirty-one".