51913318631 has 2 divisors, whose sum is σ = 51913318632. Its totient is φ = 51913318630.

The previous prime is 51913318609. The next prime is 51913318669. The reversal of 51913318631 is 13681331915.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51913318631 is a prime.

It is a super-2 number, since 2×51913318631² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51913318031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25956659315 + 25956659316.

It is an arithmetic number, because the mean of its divisors is an integer number (25956659316).

Almost surely, 2^51913318631 is an apocalyptic number.

51913318631 is a deficient number, since it is larger than the sum of its proper divisors (1).

51913318631 is an equidigital number, since it uses as much as digits as its factorization.

51913318631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 41.

The spelling of 51913318631 in words is "fifty-one billion, nine hundred thirteen million, three hundred eighteen thousand, six hundred thirty-one".