64239641 has 2 divisors, whose sum is σ = 64239642. Its totient is φ = 64239640.

The previous prime is 64239631. The next prime is 64239653. The reversal of 64239641 is 14693246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51423241 + 12816400 = 7171^2 + 3580^2 .

It is a cyclic number.

It is not a de Polignac number, because 64239641 - 2¹⁸ = 63977497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64239631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32119820 + 32119821.

It is an arithmetic number, because the mean of its divisors is an integer number (32119821).

Almost surely, 2^64239641 is an apocalyptic number.

It is an amenable number.

64239641 is a deficient number, since it is larger than the sum of its proper divisors (1).

64239641 is an equidigital number, since it uses as much as digits as its factorization.

64239641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 35.

The square root of 64239641 is about 8014.9635682266. The cubic root of 64239641 is about 400.4986302447.

The spelling of 64239641 in words is "sixty-four million, two hundred thirty-nine thousand, six hundred forty-one".