64318993 has 2 divisors, whose sum is σ = 64318994. Its totient is φ = 64318992.

The previous prime is 64318981. The next prime is 64318999. The reversal of 64318993 is 39981346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52533504 + 11785489 = 7248^2 + 3433^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64318993 is a prime.

It is not a weakly prime, because it can be changed into another prime (64318999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32159496 + 32159497.

It is an arithmetic number, because the mean of its divisors is an integer number (32159497).

Almost surely, 2^64318993 is an apocalyptic number.

It is an amenable number.

64318993 is a deficient number, since it is larger than the sum of its proper divisors (1).

64318993 is an equidigital number, since it uses as much as digits as its factorization.

64318993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 43.

The square root of 64318993 is about 8019.9122813158. The cubic root of 64318993 is about 400.6634676682.

The spelling of 64318993 in words is "sixty-four million, three hundred eighteen thousand, nine hundred ninety-three".