65431631 has 2 divisors, whose sum is σ = 65431632. Its totient is φ = 65431630.

The previous prime is 65431621. The next prime is 65431637. The reversal of 65431631 is 13613456.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65431631 - 2²² = 61237327 is a prime.

It is a super-2 number, since 2×65431631² = 8562596670640322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 65431594 and 65431603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65431637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32715815 + 32715816.

It is an arithmetic number, because the mean of its divisors is an integer number (32715816).

Almost surely, 2^65431631 is an apocalyptic number.

65431631 is a deficient number, since it is larger than the sum of its proper divisors (1).

65431631 is an equidigital number, since it uses as much as digits as its factorization.

65431631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 29.

The square root of 65431631 is about 8088.9820744022. The cubic root of 65431631 is about 402.9605976743.

The spelling of 65431631 in words is "sixty-five million, four hundred thirty-one thousand, six hundred thirty-one".