51611115631 has 2 divisors, whose sum is σ = 51611115632. Its totient is φ = 51611115630.

The previous prime is 51611115623. The next prime is 51611115641. The reversal of 51611115631 is 13651111615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51611115631 - 2³ = 51611115623 is a prime.

It is a super-2 number, since 2×51611115631² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51611115593 and 51611115602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51611115641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25805557815 + 25805557816.

It is an arithmetic number, because the mean of its divisors is an integer number (25805557816).

Almost surely, 2^51611115631 is an apocalyptic number.

51611115631 is a deficient number, since it is larger than the sum of its proper divisors (1).

51611115631 is an equidigital number, since it uses as much as digits as its factorization.

51611115631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700, while the sum is 31.

The spelling of 51611115631 in words is "fifty-one billion, six hundred eleven million, one hundred fifteen thousand, six hundred thirty-one".