51508631 has 2 divisors, whose sum is σ = 51508632. Its totient is φ = 51508630.

The previous prime is 51508627. The next prime is 51508679. The reversal of 51508631 is 13680515.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51508631 - 2² = 51508627 is a prime.

It is a super-2 number, since 2×51508631² = 5306278134988322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51508594 and 51508603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51508231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25754315 + 25754316.

It is an arithmetic number, because the mean of its divisors is an integer number (25754316).

Almost surely, 2^51508631 is an apocalyptic number.

51508631 is a deficient number, since it is larger than the sum of its proper divisors (1).

51508631 is an equidigital number, since it uses as much as digits as its factorization.

51508631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 51508631 is about 7176.9513722750. The cubic root of 51508631 is about 372.0717261586.

The spelling of 51508631 in words is "fifty-one million, five hundred eight thousand, six hundred thirty-one".