51235631 has 2 divisors, whose sum is σ = 51235632. Its totient is φ = 51235630.

The previous prime is 51235621. The next prime is 51235649. The reversal of 51235631 is 13653215.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51235631 - 2⁶ = 51235567 is a prime.

It is a super-2 number, since 2×51235631² = 5250179767936322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51235631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51235601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25617815 + 25617816.

It is an arithmetic number, because the mean of its divisors is an integer number (25617816).

Almost surely, 2^51235631 is an apocalyptic number.

51235631 is a deficient number, since it is larger than the sum of its proper divisors (1).

51235631 is an equidigital number, since it uses as much as digits as its factorization.

51235631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700, while the sum is 26.

The square root of 51235631 is about 7157.9068867931. The cubic root of 51235631 is about 371.4132244504.

Adding to 51235631 its reverse (13653215), we get a palindrome (64888846).

The spelling of 51235631 in words is "fifty-one million, two hundred thirty-five thousand, six hundred thirty-one".