64870513 has 2 divisors, whose sum is σ = 64870514. Its totient is φ = 64870512.

The previous prime is 64870489. The next prime is 64870529. The reversal of 64870513 is 31507846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42289009 + 22581504 = 6503^2 + 4752^2 .

It is a cyclic number.

It is not a de Polignac number, because 64870513 - 2²⁵ = 31316081 is a prime.

It is not a weakly prime, because it can be changed into another prime (64879513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32435256 + 32435257.

It is an arithmetic number, because the mean of its divisors is an integer number (32435257).

Almost surely, 2^64870513 is an apocalyptic number.

It is an amenable number.

64870513 is a deficient number, since it is larger than the sum of its proper divisors (1).

64870513 is an equidigital number, since it uses as much as digits as its factorization.

64870513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 64870513 is about 8054.2233020944. The cubic root of 64870513 is about 401.8054077473.

The spelling of 64870513 in words is "sixty-four million, eight hundred seventy thousand, five hundred thirteen".