64501973 has 2 divisors, whose sum is σ = 64501974. Its totient is φ = 64501972.

The previous prime is 64501939. The next prime is 64502023. The reversal of 64501973 is 37910546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49463089 + 15038884 = 7033^2 + 3878^2 .

It is a cyclic number.

It is not a de Polignac number, because 64501973 - 2¹² = 64497877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64501673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32250986 + 32250987.

It is an arithmetic number, because the mean of its divisors is an integer number (32250987).

Almost surely, 2^64501973 is an apocalyptic number.

It is an amenable number.

64501973 is a deficient number, since it is larger than the sum of its proper divisors (1).

64501973 is an equidigital number, since it uses as much as digits as its factorization.

64501973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 64501973 is about 8031.3120347799. The cubic root of 64501973 is about 401.0430548108.

The spelling of 64501973 in words is "sixty-four million, five hundred one thousand, nine hundred seventy-three".