56172909 has 16 divisors (see below), whose sum is σ = 81091584. Its totient is φ = 34382400.

The previous prime is 56172889. The next prime is 56172917. The reversal of 56172909 is 90927165.

56172909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 56172909 - 2¹² = 56168813 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56170909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3679 + ... + 11219.

It is an arithmetic number, because the mean of its divisors is an integer number (5068224).

Almost surely, 2^56172909 is an apocalyptic number.

It is an amenable number.

56172909 is a deficient number, since it is larger than the sum of its proper divisors (24918675).

56172909 is a wasteful number, since it uses less digits than its factorization.

56172909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7748.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 56172909 is about 7494.8588378968. The cubic root of 56172909 is about 382.9795974743.

The spelling of 56172909 in words is "fifty-six million, one hundred seventy-two thousand, nine hundred nine".