64253281 has 2 divisors, whose sum is σ = 64253282. Its totient is φ = 64253280.

The previous prime is 64253257. The next prime is 64253291. The reversal of 64253281 is 18235246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45900625 + 18352656 = 6775^2 + 4284^2 .

It is a cyclic number.

It is not a de Polignac number, because 64253281 - 2⁵ = 64253249 is a prime.

It is a super-2 number, since 2×64253281² = 8256968238529922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64253221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32126640 + 32126641.

It is an arithmetic number, because the mean of its divisors is an integer number (32126641).

Almost surely, 2^64253281 is an apocalyptic number.

It is an amenable number.

64253281 is a deficient number, since it is larger than the sum of its proper divisors (1).

64253281 is an equidigital number, since it uses as much as digits as its factorization.

64253281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 31.

The square root of 64253281 is about 8015.8144314848. The cubic root of 64253281 is about 400.5269741906.

The spelling of 64253281 in words is "sixty-four million, two hundred fifty-three thousand, two hundred eighty-one".