56561869 has 16 divisors (see below), whose sum is σ = 70661248. Its totient is φ = 44079552.

The previous prime is 56561851. The next prime is 56561891. The reversal of 56561869 is 96816565.

It is a cyclic number.

It is not a de Polignac number, because 56561869 - 2⁹ = 56561357 is a prime.

It is a super-2 number, since 2×56561869² = 6398490049546322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56561809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1459 + ... + 10735.

It is an arithmetic number, because the mean of its divisors is an integer number (4416328).

Almost surely, 2^56561869 is an apocalyptic number.

It is an amenable number.

56561869 is a deficient number, since it is larger than the sum of its proper divisors (14099379).

56561869 is a wasteful number, since it uses less digits than its factorization.

56561869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9364.

The product of its digits is 388800, while the sum is 46.

The square root of 56561869 is about 7520.7625278292. The cubic root of 56561869 is about 383.8615245962.

The spelling of 56561869 in words is "fifty-six million, five hundred sixty-one thousand, eight hundred sixty-nine".