64513913 has 2 divisors, whose sum is σ = 64513914. Its totient is φ = 64513912.

The previous prime is 64513907. The next prime is 64513921. The reversal of 64513913 is 31931546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58323769 + 6190144 = 7637^2 + 2488^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64513913 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 64513913.

It is not a weakly prime, because it can be changed into another prime (64513013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32256956 + 32256957.

It is an arithmetic number, because the mean of its divisors is an integer number (32256957).

Almost surely, 2^64513913 is an apocalyptic number.

It is an amenable number.

64513913 is a deficient number, since it is larger than the sum of its proper divisors (1).

64513913 is an equidigital number, since it uses as much as digits as its factorization.

64513913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 32.

The square root of 64513913 is about 8032.0553409448. The cubic root of 64513913 is about 401.0677990598.

The spelling of 64513913 in words is "sixty-four million, five hundred thirteen thousand, nine hundred thirteen".