64315819 has 2 divisors, whose sum is σ = 64315820. Its totient is φ = 64315818.

The previous prime is 64315807. The next prime is 64315859. The reversal of 64315819 is 91851346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64315819 - 2²³ = 55927211 is a prime.

It is a super-2 number, since 2×64315819² = 8273049147281522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64315859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32157909 + 32157910.

It is an arithmetic number, because the mean of its divisors is an integer number (32157910).

Almost surely, 2^64315819 is an apocalyptic number.

64315819 is a deficient number, since it is larger than the sum of its proper divisors (1).

64315819 is an equidigital number, since it uses as much as digits as its factorization.

64315819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 37.

The square root of 64315819 is about 8019.7143964109. The cubic root of 64315819 is about 400.6568769412.

The spelling of 64315819 in words is "sixty-four million, three hundred fifteen thousand, eight hundred nineteen".