64115257 has 2 divisors, whose sum is σ = 64115258. Its totient is φ = 64115256.

The previous prime is 64115221. The next prime is 64115263. The reversal of 64115257 is 75251146.

64115257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34292736 + 29822521 = 5856^2 + 5461^2 .

It is a cyclic number.

It is not a de Polignac number, because 64115257 - 2¹¹ = 64113209 is a prime.

It is a super-2 number, since 2×64115257² = 8221532360352098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64115287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32057628 + 32057629.

It is an arithmetic number, because the mean of its divisors is an integer number (32057629).

Almost surely, 2^64115257 is an apocalyptic number.

It is an amenable number.

64115257 is a deficient number, since it is larger than the sum of its proper divisors (1).

64115257 is an equidigital number, since it uses as much as digits as its factorization.

64115257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8400, while the sum is 31.

The square root of 64115257 is about 8007.2003222100. The cubic root of 64115257 is about 400.2399747515.

The spelling of 64115257 in words is "sixty-four million, one hundred fifteen thousand, two hundred fifty-seven".