64652981 has 2 divisors, whose sum is σ = 64652982. Its totient is φ = 64652980.

The previous prime is 64652971. The next prime is 64652983. The reversal of 64652981 is 18925646.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48580900 + 16072081 = 6970^2 + 4009^2 .

It is a cyclic number.

It is not a de Polignac number, because 64652981 - 2¹⁴ = 64636597 is a prime.

It is a super-2 number, since 2×64652981² = 8360015904372722, which contains 22 as substring.

Together with 64652983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64652983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32326490 + 32326491.

It is an arithmetic number, because the mean of its divisors is an integer number (32326491).

Almost surely, 2^64652981 is an apocalyptic number.

It is an amenable number.

64652981 is a deficient number, since it is larger than the sum of its proper divisors (1).

64652981 is an equidigital number, since it uses as much as digits as its factorization.

64652981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 41.

The square root of 64652981 is about 8040.7077424814. The cubic root of 64652981 is about 401.3557765662.

The spelling of 64652981 in words is "sixty-four million, six hundred fifty-two thousand, nine hundred eighty-one".