64120691 has 2 divisors, whose sum is σ = 64120692. Its totient is φ = 64120690.

The previous prime is 64120627. The next prime is 64120717. The reversal of 64120691 is 19602146.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64120691 - 2⁶ = 64120627 is a prime.

It is a super-2 number, since 2×64120691² = 8222926028634962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64120601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32060345 + 32060346.

It is an arithmetic number, because the mean of its divisors is an integer number (32060346).

Almost surely, 2^64120691 is an apocalyptic number.

64120691 is a deficient number, since it is larger than the sum of its proper divisors (1).

64120691 is an equidigital number, since it uses as much as digits as its factorization.

64120691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 64120691 is about 8007.5396346194. The cubic root of 64120691 is about 400.2512816941.

The spelling of 64120691 in words is "sixty-four million, one hundred twenty thousand, six hundred ninety-one".