64251139 has 2 divisors, whose sum is σ = 64251140. Its totient is φ = 64251138.

The previous prime is 64251137. The next prime is 64251149. The reversal of 64251139 is 93115246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64251139 - 2¹ = 64251137 is a prime.

Together with 64251137, it forms a pair of twin primes.

It is equal to p_3799012 and since 64251139 and 3799012 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64251139.

It is not a weakly prime, because it can be changed into another prime (64251133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32125569 + 32125570.

It is an arithmetic number, because the mean of its divisors is an integer number (32125570).

Almost surely, 2^64251139 is an apocalyptic number.

64251139 is a deficient number, since it is larger than the sum of its proper divisors (1).

64251139 is an equidigital number, since it uses as much as digits as its factorization.

64251139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 31.

The square root of 64251139 is about 8015.6808194938. The cubic root of 64251139 is about 400.5225233761.

The spelling of 64251139 in words is "sixty-four million, two hundred fifty-one thousand, one hundred thirty-nine".