64801591 has 2 divisors, whose sum is σ = 64801592. Its totient is φ = 64801590.

The previous prime is 64801553. The next prime is 64801601. The reversal of 64801591 is 19510846.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64801591 - 2²⁵ = 31247159 is a prime.

It is a super-2 number, since 2×64801591² = 8398492392262562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64801531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32400795 + 32400796.

It is an arithmetic number, because the mean of its divisors is an integer number (32400796).

Almost surely, 2^64801591 is an apocalyptic number.

64801591 is a deficient number, since it is larger than the sum of its proper divisors (1).

64801591 is an equidigital number, since it uses as much as digits as its factorization.

64801591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 64801591 is about 8049.9435401747. The cubic root of 64801591 is about 401.6630572688.

The spelling of 64801591 in words is "sixty-four million, eight hundred one thousand, five hundred ninety-one".