64211491 has 2 divisors, whose sum is σ = 64211492. Its totient is φ = 64211490.

The previous prime is 64211479. The next prime is 64211501. The reversal of 64211491 is 19411246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64211491 - 2²⁵ = 30657059 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64215491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32105745 + 32105746.

It is an arithmetic number, because the mean of its divisors is an integer number (32105746).

Almost surely, 2^64211491 is an apocalyptic number.

64211491 is a deficient number, since it is larger than the sum of its proper divisors (1).

64211491 is an equidigital number, since it uses as much as digits as its factorization.

64211491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 28.

The square root of 64211491 is about 8013.2072854756. The cubic root of 64211491 is about 400.4401218044.

The spelling of 64211491 in words is "sixty-four million, two hundred eleven thousand, four hundred ninety-one".