64501309 has 2 divisors, whose sum is σ = 64501310. Its totient is φ = 64501308.

The previous prime is 64501291. The next prime is 64501331. The reversal of 64501309 is 90310546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45185284 + 19316025 = 6722^2 + 4395^2 .

It is a cyclic number.

It is not a de Polignac number, because 64501309 - 2⁵ = 64501277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64501109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32250654 + 32250655.

It is an arithmetic number, because the mean of its divisors is an integer number (32250655).

Almost surely, 2^64501309 is an apocalyptic number.

It is an amenable number.

64501309 is a deficient number, since it is larger than the sum of its proper divisors (1).

64501309 is an equidigital number, since it uses as much as digits as its factorization.

64501309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 64501309 is about 8031.2706964714. The cubic root of 64501309 is about 401.0416786591.

The spelling of 64501309 in words is "sixty-four million, five hundred one thousand, three hundred nine".