56099561 has 6 divisors (see below), whose sum is σ = 65258730. Its totient is φ = 48085296.

The previous prime is 56099557. The next prime is 56099567. The reversal of 56099561 is 16599065.

It can be written as a sum of positive squares in only one way, i.e., 55785961 + 313600 = 7469^2 + 560^2 .

It is not a de Polignac number, because 56099561 - 2² = 56099557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56099567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 572396 + ... + 572493.

It is an arithmetic number, because the mean of its divisors is an integer number (10876455).

Almost surely, 2^56099561 is an apocalyptic number.

It is an amenable number.

56099561 is a deficient number, since it is larger than the sum of its proper divisors (9159169).

56099561 is a wasteful number, since it uses less digits than its factorization.

56099561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144903 (or 1144896 counting only the distinct ones).

The product of its (nonzero) digits is 72900, while the sum is 41.

The square root of 56099561 is about 7489.9640186052. The cubic root of 56099561 is about 382.8128324895.

The spelling of 56099561 in words is "fifty-six million, ninety-nine thousand, five hundred sixty-one".