64631117 has 2 divisors, whose sum is σ = 64631118. Its totient is φ = 64631116.

The previous prime is 64631113. The next prime is 64631167. The reversal of 64631117 is 71113646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59382436 + 5248681 = 7706^2 + 2291^2 .

It is a cyclic number.

It is not a de Polignac number, because 64631117 - 2² = 64631113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64631117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64631113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32315558 + 32315559.

It is an arithmetic number, because the mean of its divisors is an integer number (32315559).

Almost surely, 2^64631117 is an apocalyptic number.

It is an amenable number.

64631117 is a deficient number, since it is larger than the sum of its proper divisors (1).

64631117 is an equidigital number, since it uses as much as digits as its factorization.

64631117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 29.

The square root of 64631117 is about 8039.3480457062. The cubic root of 64631117 is about 401.3105286806.

The spelling of 64631117 in words is "sixty-four million, six hundred thirty-one thousand, one hundred seventeen".