64942517 has 2 divisors, whose sum is σ = 64942518. Its totient is φ = 64942516.

The previous prime is 64942487. The next prime is 64942573. The reversal of 64942517 is 71524946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51466276 + 13476241 = 7174^2 + 3671^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64942517 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64942597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32471258 + 32471259.

It is an arithmetic number, because the mean of its divisors is an integer number (32471259).

Almost surely, 2^64942517 is an apocalyptic number.

It is an amenable number.

64942517 is a deficient number, since it is larger than the sum of its proper divisors (1).

64942517 is an equidigital number, since it uses as much as digits as its factorization.

64942517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 38.

The square root of 64942517 is about 8058.6920154576. The cubic root of 64942517 is about 401.9540160928.

The spelling of 64942517 in words is "sixty-four million, nine hundred forty-two thousand, five hundred seventeen".