64719251 has 2 divisors, whose sum is σ = 64719252. Its totient is φ = 64719250.

The previous prime is 64719247. The next prime is 64719299. The reversal of 64719251 is 15291746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64719251 - 2² = 64719247 is a prime.

It is not a weakly prime, because it can be changed into another prime (64719241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32359625 + 32359626.

It is an arithmetic number, because the mean of its divisors is an integer number (32359626).

Almost surely, 2^64719251 is an apocalyptic number.

64719251 is a deficient number, since it is larger than the sum of its proper divisors (1).

64719251 is an equidigital number, since it uses as much as digits as its factorization.

64719251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 35.

The square root of 64719251 is about 8044.8275929320. The cubic root of 64719251 is about 401.4928610666.

The spelling of 64719251 in words is "sixty-four million, seven hundred nineteen thousand, two hundred fifty-one".