65312581 has 2 divisors, whose sum is σ = 65312582. Its totient is φ = 65312580.

The previous prime is 65312573. The next prime is 65312591. The reversal of 65312581 is 18521356.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47748100 + 17564481 = 6910^2 + 4191^2 .

It is a cyclic number.

It is not a de Polignac number, because 65312581 - 2³ = 65312573 is a prime.

It is a super-2 number, since 2×65312581² = 8531466473763122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65312591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32656290 + 32656291.

It is an arithmetic number, because the mean of its divisors is an integer number (32656291).

Almost surely, 2^65312581 is an apocalyptic number.

It is an amenable number.

65312581 is a deficient number, since it is larger than the sum of its proper divisors (1).

65312581 is an equidigital number, since it uses as much as digits as its factorization.

65312581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 31.

The square root of 65312581 is about 8081.6199489954. The cubic root of 65312581 is about 402.7160595589.

The spelling of 65312581 in words is "sixty-five million, three hundred twelve thousand, five hundred eighty-one".