64288921 has 2 divisors, whose sum is σ = 64288922. Its totient is φ = 64288920.

The previous prime is 64288901. The next prime is 64288949. The reversal of 64288921 is 12988246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60918025 + 3370896 = 7805^2 + 1836^2 .

It is a cyclic number.

It is not a de Polignac number, because 64288921 - 2⁷ = 64288793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64288901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32144460 + 32144461.

It is an arithmetic number, because the mean of its divisors is an integer number (32144461).

Almost surely, 2^64288921 is an apocalyptic number.

It is an amenable number.

64288921 is a deficient number, since it is larger than the sum of its proper divisors (1).

64288921 is an equidigital number, since it uses as much as digits as its factorization.

64288921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 40.

The square root of 64288921 is about 8018.0372286489. The cubic root of 64288921 is about 400.6010152494.

The spelling of 64288921 in words is "sixty-four million, two hundred eighty-eight thousand, nine hundred twenty-one".