64097581 has 2 divisors, whose sum is σ = 64097582. Its totient is φ = 64097580.

The previous prime is 64097567. The next prime is 64097587. The reversal of 64097581 is 18579046.

64097581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48177481 + 15920100 = 6941^2 + 3990^2 .

It is a cyclic number.

It is not a de Polignac number, because 64097581 - 2⁵ = 64097549 is a prime.

It is a super-2 number, since 2×64097581² = 8216999780103122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64097587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32048790 + 32048791.

It is an arithmetic number, because the mean of its divisors is an integer number (32048791).

Almost surely, 2^64097581 is an apocalyptic number.

64097581 is the 5064-th centered pentagonal number.

It is an amenable number.

64097581 is a deficient number, since it is larger than the sum of its proper divisors (1).

64097581 is an equidigital number, since it uses as much as digits as its factorization.

64097581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 64097581 is about 8006.0964895509. The cubic root of 64097581 is about 400.2031905166.

The spelling of 64097581 in words is "sixty-four million, ninety-seven thousand, five hundred eighty-one".