64312939 has 2 divisors, whose sum is σ = 64312940. Its totient is φ = 64312938.

The previous prime is 64312909. The next prime is 64312949. The reversal of 64312939 is 93921346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64312939 - 2¹¹ = 64310891 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64312898 and 64312907.

It is not a weakly prime, because it can be changed into another prime (64312909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32156469 + 32156470.

It is an arithmetic number, because the mean of its divisors is an integer number (32156470).

Almost surely, 2^64312939 is an apocalyptic number.

64312939 is a deficient number, since it is larger than the sum of its proper divisors (1).

64312939 is an equidigital number, since it uses as much as digits as its factorization.

64312939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 37.

The square root of 64312939 is about 8019.5348368842. The cubic root of 64312939 is about 400.6508965098.

The spelling of 64312939 in words is "sixty-four million, three hundred twelve thousand, nine hundred thirty-nine".