56561101 has 4 divisors (see below), whose sum is σ = 57006592. Its totient is φ = 56115612.

The previous prime is 56561059. The next prime is 56561129. The reversal of 56561101 is 10116565.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10116565 = 5 ⋅2023313.

It is a cyclic number.

It is not a de Polignac number, because 56561101 - 2¹¹ = 56559053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56561161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222555 + ... + 222808.

It is an arithmetic number, because the mean of its divisors is an integer number (14251648).

Almost surely, 2^56561101 is an apocalyptic number.

It is an amenable number.

56561101 is a deficient number, since it is larger than the sum of its proper divisors (445491).

56561101 is a wasteful number, since it uses less digits than its factorization.

56561101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445490.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 56561101 is about 7520.7114690034. The cubic root of 56561101 is about 383.8597872244.

Adding to 56561101 its reverse (10116565), we get a palindrome (66677666).

The spelling of 56561101 in words is "fifty-six million, five hundred sixty-one thousand, one hundred one".