56019809 has 4 divisors (see below), whose sum is σ = 58968240. Its totient is φ = 53071380.

The previous prime is 56019797. The next prime is 56019823. The reversal of 56019809 is 90891065.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56019809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56019829) 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, 1474187 + ... + 1474224.

It is an arithmetic number, because the mean of its divisors is an integer number (14742060).

Almost surely, 2^56019809 is an apocalyptic number.

It is an amenable number.

56019809 is a deficient number, since it is larger than the sum of its proper divisors (2948431).

56019809 is a wasteful number, since it uses less digits than its factorization.

56019809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2948430.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 56019809 is about 7484.6382010088. The cubic root of 56019809 is about 382.6313422529.

The spelling of 56019809 in words is "fifty-six million, nineteen thousand, eight hundred nine".