64253989 has 2 divisors, whose sum is σ = 64253990. Its totient is φ = 64253988.

The previous prime is 64253957. The next prime is 64254007. The reversal of 64253989 is 98935246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51365889 + 12888100 = 7167^2 + 3590^2 .

It is a cyclic number.

It is not a de Polignac number, because 64253989 - 2⁵ = 64253957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64253909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32126994 + 32126995.

It is an arithmetic number, because the mean of its divisors is an integer number (32126995).

Almost surely, 2^64253989 is an apocalyptic number.

It is an amenable number.

64253989 is a deficient number, since it is larger than the sum of its proper divisors (1).

64253989 is an equidigital number, since it uses as much as digits as its factorization.

64253989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 46.

The square root of 64253989 is about 8015.8585940621. The cubic root of 64253989 is about 400.5284453065.

The spelling of 64253989 in words is "sixty-four million, two hundred fifty-three thousand, nine hundred eighty-nine".