64636109 has 2 divisors, whose sum is σ = 64636110. Its totient is φ = 64636108.

The previous prime is 64636079. The next prime is 64636123. The reversal of 64636109 is 90163646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34550884 + 30085225 = 5878^2 + 5485^2 .

It is a cyclic number.

It is not a de Polignac number, because 64636109 - 2²⁰ = 63587533 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 (64636129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32318054 + 32318055.

It is an arithmetic number, because the mean of its divisors is an integer number (32318055).

Almost surely, 2^64636109 is an apocalyptic number.

It is an amenable number.

64636109 is a deficient number, since it is larger than the sum of its proper divisors (1).

64636109 is an equidigital number, since it uses as much as digits as its factorization.

64636109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 64636109 is about 8039.6585126484. The cubic root of 64636109 is about 401.3208606005.

The spelling of 64636109 in words is "sixty-four million, six hundred thirty-six thousand, one hundred nine".