64144889 has 2 divisors, whose sum is σ = 64144890. Its totient is φ = 64144888.

The previous prime is 64144853. The next prime is 64144909. The reversal of 64144889 is 98844146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35200489 + 28944400 = 5933^2 + 5380^2 .

It is a cyclic number.

It is not a de Polignac number, because 64144889 - 2²⁴ = 47367673 is a prime.

It is a super-2 number, since 2×64144889² = 8229133569644642, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64144819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32072444 + 32072445.

It is an arithmetic number, because the mean of its divisors is an integer number (32072445).

Almost surely, 2^64144889 is an apocalyptic number.

It is an amenable number.

64144889 is a deficient number, since it is larger than the sum of its proper divisors (1).

64144889 is an equidigital number, since it uses as much as digits as its factorization.

64144889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 221184, while the sum is 44.

The square root of 64144889 is about 8009.0504430925. The cubic root of 64144889 is about 400.3016245827.

The spelling of 64144889 in words is "sixty-four million, one hundred forty-four thousand, eight hundred eighty-nine".