64135531 has 2 divisors, whose sum is σ = 64135532. Its totient is φ = 64135530.

The previous prime is 64135493. The next prime is 64135579. The reversal of 64135531 is 13553146.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64135531 - 2¹⁵ = 64102763 is a prime.

It is a super-2 number, since 2×64135531² = 8226732673303922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64135531.

It is not a weakly prime, because it can be changed into another prime (64135031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32067765 + 32067766.

It is an arithmetic number, because the mean of its divisors is an integer number (32067766).

Almost surely, 2^64135531 is an apocalyptic number.

64135531 is a deficient number, since it is larger than the sum of its proper divisors (1).

64135531 is an equidigital number, since it uses as much as digits as its factorization.

64135531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 28.

The square root of 64135531 is about 8008.4662077079. The cubic root of 64135531 is about 400.2821571715.

Adding to 64135531 its reverse (13553146), we get a palindrome (77688677).

The spelling of 64135531 in words is "sixty-four million, one hundred thirty-five thousand, five hundred thirty-one".