51013605631 has 2 divisors, whose sum is σ = 51013605632. Its totient is φ = 51013605630.

The previous prime is 51013605613. The next prime is 51013605641. The reversal of 51013605631 is 13650631015.

Together with previous prime (51013605613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51013605631 - 2⁹ = 51013605119 is a prime.

It is a super-2 number, since 2×51013605631² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51013605593 and 51013605602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51013605641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25506802815 + 25506802816.

It is an arithmetic number, because the mean of its divisors is an integer number (25506802816).

Almost surely, 2^51013605631 is an apocalyptic number.

51013605631 is a deficient number, since it is larger than the sum of its proper divisors (1).

51013605631 is an equidigital number, since it uses as much as digits as its factorization.

51013605631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 31.

The spelling of 51013605631 in words is "fifty-one billion, thirteen million, six hundred five thousand, six hundred thirty-one".