64431589 has 2 divisors, whose sum is σ = 64431590. Its totient is φ = 64431588.

The previous prime is 64431559. The next prime is 64431607. The reversal of 64431589 is 98513446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58828900 + 5602689 = 7670^2 + 2367^2 .

It is a cyclic number.

It is not a de Polignac number, because 64431589 - 2⁵ = 64431557 is a prime.

It is a super-2 number, since 2×64431589² = 8302859322129842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64431509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32215794 + 32215795.

It is an arithmetic number, because the mean of its divisors is an integer number (32215795).

Almost surely, 2^64431589 is an apocalyptic number.

It is an amenable number.

64431589 is a deficient number, since it is larger than the sum of its proper divisors (1).

64431589 is an equidigital number, since it uses as much as digits as its factorization.

64431589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 40.

The square root of 64431589 is about 8026.9289893458. The cubic root of 64431589 is about 400.8971301395.

The spelling of 64431589 in words is "sixty-four million, four hundred thirty-one thousand, five hundred eighty-nine".