56249561 has 2 divisors, whose sum is σ = 56249562. Its totient is φ = 56249560.

The previous prime is 56249429. The next prime is 56249587. The reversal of 56249561 is 16594265.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49843600 + 6405961 = 7060^2 + 2531^2 .

It is a cyclic number.

It is not a de Polignac number, because 56249561 - 2¹⁰ = 56248537 is a prime.

It is a super-2 number, since 2×56249561² = 6328026225385442, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56249591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28124780 + 28124781.

It is an arithmetic number, because the mean of its divisors is an integer number (28124781).

Almost surely, 2^56249561 is an apocalyptic number.

It is an amenable number.

56249561 is a deficient number, since it is larger than the sum of its proper divisors (1).

56249561 is an equidigital number, since it uses as much as digits as its factorization.

56249561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 38.

The square root of 56249561 is about 7499.9707332762. The cubic root of 56249561 is about 383.1537194243.

The spelling of 56249561 in words is "fifty-six million, two hundred forty-nine thousand, five hundred sixty-one".