56001561 has 48 divisors (see below), whose sum is σ = 96526080. Its totient is φ = 28549920.

The previous prime is 56001541. The next prime is 56001577. The reversal of 56001561 is 16510065.

It is not a de Polignac number, because 56001561 - 2⁵ = 56001529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56001541) 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 47 ways as a sum of consecutive naturals, for example, 95110 + ... + 95696.

It is an arithmetic number, because the mean of its divisors is an integer number (2010960).

Almost surely, 2^56001561 is an apocalyptic number.

It is an amenable number.

56001561 is a deficient number, since it is larger than the sum of its proper divisors (40524519).

56001561 is a wasteful number, since it uses less digits than its factorization.

56001561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674 (or 667 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 56001561 is about 7483.4190715207. The cubic root of 56001561 is about 382.5897913852.

The spelling of 56001561 in words is "fifty-six million, one thousand, five hundred sixty-one".