64015631 has 2 divisors, whose sum is σ = 64015632. Its totient is φ = 64015630.

The previous prime is 64015621. The next prime is 64015643. The reversal of 64015631 is 13651046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64015631 - 2²² = 59821327 is a prime.

It is a super-2 number, since 2×64015631² = 8196002024656322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64015631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64015621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32007815 + 32007816.

It is an arithmetic number, because the mean of its divisors is an integer number (32007816).

Almost surely, 2^64015631 is an apocalyptic number.

64015631 is a deficient number, since it is larger than the sum of its proper divisors (1).

64015631 is an equidigital number, since it uses as much as digits as its factorization.

64015631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 64015631 is about 8000.9768778569. The cubic root of 64015631 is about 400.0325619326.

Adding to 64015631 its reverse (13651046), we get a palindrome (77666677).

It can be divided in two parts, 64015 and 631, that added together give a palindrome (64646).

The spelling of 64015631 in words is "sixty-four million, fifteen thousand, six hundred thirty-one".