64913257 has 2 divisors, whose sum is σ = 64913258. Its totient is φ = 64913256.

The previous prime is 64913249. The next prime is 64913263. The reversal of 64913257 is 75231946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54997056 + 9916201 = 7416^2 + 3149^2 .

It is a cyclic number.

It is not a de Polignac number, because 64913257 - 2³ = 64913249 is a prime.

It is equal to p_3835729 and since 64913257 and 3835729 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (64913267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32456628 + 32456629.

It is an arithmetic number, because the mean of its divisors is an integer number (32456629).

Almost surely, 2^64913257 is an apocalyptic number.

It is an amenable number.

64913257 is a deficient number, since it is larger than the sum of its proper divisors (1).

64913257 is an equidigital number, since it uses as much as digits as its factorization.

64913257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 37.

The square root of 64913257 is about 8056.8763798385. The cubic root of 64913257 is about 401.8936399230.

The spelling of 64913257 in words is "sixty-four million, nine hundred thirteen thousand, two hundred fifty-seven".