64989013 has 2 divisors, whose sum is σ = 64989014. Its totient is φ = 64989012.

The previous prime is 64988999. The next prime is 64989037. The reversal of 64989013 is 31098946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44395569 + 20593444 = 6663^2 + 4538^2 .

It is a cyclic number.

It is not a de Polignac number, because 64989013 - 2⁵ = 64988981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64989073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32494506 + 32494507.

It is an arithmetic number, because the mean of its divisors is an integer number (32494507).

Almost surely, 2^64989013 is an apocalyptic number.

It is an amenable number.

64989013 is a deficient number, since it is larger than the sum of its proper divisors (1).

64989013 is an equidigital number, since it uses as much as digits as its factorization.

64989013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 64989013 is about 8061.5763346879. The cubic root of 64989013 is about 402.0499203701.

The spelling of 64989013 in words is "sixty-four million, nine hundred eighty-nine thousand, thirteen".