56243581 has 2 divisors, whose sum is σ = 56243582. Its totient is φ = 56243580.

The previous prime is 56243521. The next prime is 56243609. The reversal of 56243581 is 18534265.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36360900 + 19882681 = 6030^2 + 4459^2 .

It is a cyclic number.

It is not a de Polignac number, because 56243581 - 2¹⁵ = 56210813 is a prime.

It is a super-2 number, since 2×56243581² = 6326680807407122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56243521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28121790 + 28121791.

It is an arithmetic number, because the mean of its divisors is an integer number (28121791).

Almost surely, 2^56243581 is an apocalyptic number.

It is an amenable number.

56243581 is a deficient number, since it is larger than the sum of its proper divisors (1).

56243581 is an equidigital number, since it uses as much as digits as its factorization.

56243581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 34.

The square root of 56243581 is about 7499.5720544575. The cubic root of 56243581 is about 383.1401410046.

The spelling of 56243581 in words is "fifty-six million, two hundred forty-three thousand, five hundred eighty-one".