64064491 has 2 divisors, whose sum is σ = 64064492. Its totient is φ = 64064490.

The previous prime is 64064489. The next prime is 64064503. The reversal of 64064491 is 19446046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64064491 - 2¹ = 64064489 is a prime.

Together with 64064489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (64064411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32032245 + 32032246.

It is an arithmetic number, because the mean of its divisors is an integer number (32032246).

Almost surely, 2^64064491 is an apocalyptic number.

64064491 is a deficient number, since it is larger than the sum of its proper divisors (1).

64064491 is an equidigital number, since it uses as much as digits as its factorization.

64064491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 64064491 is about 8004.0296726087. The cubic root of 64064491 is about 400.1343111462.

The spelling of 64064491 in words is "sixty-four million, sixty-four thousand, four hundred ninety-one".