64598981 has 2 divisors, whose sum is σ = 64598982. Its totient is φ = 64598980.

The previous prime is 64598971. The next prime is 64599013. The reversal of 64598981 is 18989546.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35880100 + 28718881 = 5990^2 + 5359^2 .

It is a cyclic number.

It is not a de Polignac number, because 64598981 - 2²² = 60404677 is a prime.

It is a super-3 number, since 3×64598981³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64598951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32299490 + 32299491.

It is an arithmetic number, because the mean of its divisors is an integer number (32299491).

Almost surely, 2^64598981 is an apocalyptic number.

It is an amenable number.

64598981 is a deficient number, since it is larger than the sum of its proper divisors (1).

64598981 is an equidigital number, since it uses as much as digits as its factorization.

64598981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 50.

The square root of 64598981 is about 8037.3491276664. The cubic root of 64598981 is about 401.2440042064.

The spelling of 64598981 in words is "sixty-four million, five hundred ninety-eight thousand, nine hundred eighty-one".