65131020631 has 2 divisors, whose sum is σ = 65131020632. Its totient is φ = 65131020630.

The previous prime is 65131020629. The next prime is 65131020641. The reversal of 65131020631 is 13602013156.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65131020631 - 2¹ = 65131020629 is a prime.

It is a super-2 number, since 2×65131020631² (a number of 22 digits) contains 22 as substring.

Together with 65131020629, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 65131020631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65131020601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32565510315 + 32565510316.

It is an arithmetic number, because the mean of its divisors is an integer number (32565510316).

Almost surely, 2^65131020631 is an apocalyptic number.

65131020631 is a deficient number, since it is larger than the sum of its proper divisors (1).

65131020631 is an equidigital number, since it uses as much as digits as its factorization.

65131020631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 28.

Adding to 65131020631 its reverse (13602013156), we get a palindrome (78733033787).

The spelling of 65131020631 in words is "sixty-five billion, one hundred thirty-one million, twenty thousand, six hundred thirty-one".