64157213 has 2 divisors, whose sum is σ = 64157214. Its totient is φ = 64157212.

The previous prime is 64157183. The next prime is 64157221. The reversal of 64157213 is 31275146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63712324 + 444889 = 7982^2 + 667^2 .

It is a cyclic number.

It is not a de Polignac number, because 64157213 - 2⁸ = 64156957 is a prime.

It is a super-2 number, since 2×64157213² = 8232295959854738, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64157273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32078606 + 32078607.

It is an arithmetic number, because the mean of its divisors is an integer number (32078607).

Almost surely, 2^64157213 is an apocalyptic number.

It is an amenable number.

64157213 is a deficient number, since it is larger than the sum of its proper divisors (1).

64157213 is an equidigital number, since it uses as much as digits as its factorization.

64157213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 29.

The square root of 64157213 is about 8009.8197857380. The cubic root of 64157213 is about 400.3272592638.

The spelling of 64157213 in words is "sixty-four million, one hundred fifty-seven thousand, two hundred thirteen".