64091917 has 2 divisors, whose sum is σ = 64091918. Its totient is φ = 64091916.

The previous prime is 64091899. The next prime is 64091933. The reversal of 64091917 is 71919046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53890281 + 10201636 = 7341^2 + 3194^2 .

It is a cyclic number.

It is not a de Polignac number, because 64091917 - 2⁷ = 64091789 is a prime.

It is equal to p_3790189 and since 64091917 and 3790189 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64091957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32045958 + 32045959.

It is an arithmetic number, because the mean of its divisors is an integer number (32045959).

Almost surely, 2^64091917 is an apocalyptic number.

It is an amenable number.

64091917 is a deficient number, since it is larger than the sum of its proper divisors (1).

64091917 is an equidigital number, since it uses as much as digits as its factorization.

64091917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 64091917 is about 8005.7427513005. The cubic root of 64091917 is about 400.1914021484.

The spelling of 64091917 in words is "sixty-four million, ninety-one thousand, nine hundred seventeen".