64885181 has 2 divisors, whose sum is σ = 64885182. Its totient is φ = 64885180.

The previous prime is 64885169. The next prime is 64885199. The reversal of 64885181 is 18158846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63457156 + 1428025 = 7966^2 + 1195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64885181 is a prime.

It is a super-2 number, since 2×64885181² = 8420173426805522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64885111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32442590 + 32442591.

It is an arithmetic number, because the mean of its divisors is an integer number (32442591).

Almost surely, 2^64885181 is an apocalyptic number.

It is an amenable number.

64885181 is a deficient number, since it is larger than the sum of its proper divisors (1).

64885181 is an equidigital number, since it uses as much as digits as its factorization.

64885181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61440, while the sum is 41.

The square root of 64885181 is about 8055.1338288076. The cubic root of 64885181 is about 401.8356898036.

The spelling of 64885181 in words is "sixty-four million, eight hundred eighty-five thousand, one hundred eighty-one".