64945939 has 2 divisors, whose sum is σ = 64945940. Its totient is φ = 64945938.

The previous prime is 64945931. The next prime is 64945949. The reversal of 64945939 is 93954946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64945939 - 2³ = 64945931 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 64945892 and 64945901.

It is not a weakly prime, because it can be changed into another prime (64945931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32472969 + 32472970.

It is an arithmetic number, because the mean of its divisors is an integer number (32472970).

Almost surely, 2^64945939 is an apocalyptic number.

64945939 is a deficient number, since it is larger than the sum of its proper divisors (1).

64945939 is an equidigital number, since it uses as much as digits as its factorization.

64945939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1049760, while the sum is 49.

The square root of 64945939 is about 8058.9043299942. The cubic root of 64945939 is about 401.9610759900.

The spelling of 64945939 in words is "sixty-four million, nine hundred forty-five thousand, nine hundred thirty-nine".