56811909 has 96 divisors (see below), whose sum is σ = 107513856. Its totient is φ = 25850880.

The previous prime is 56811893. The next prime is 56811917. The reversal of 56811909 is 90911865.

It is not a de Polignac number, because 56811909 - 2⁴ = 56811893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56811409) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1535439 + ... + 1535475.

It is an arithmetic number, because the mean of its divisors is an integer number (1119936).

Almost surely, 2^56811909 is an apocalyptic number.

It is an amenable number.

56811909 is a deficient number, since it is larger than the sum of its proper divisors (50701947).

56811909 is a wasteful number, since it uses less digits than its factorization.

56811909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 56811909 is about 7537.3675112734. The cubic root of 56811909 is about 384.4263317789.

The spelling of 56811909 in words is "fifty-six million, eight hundred eleven thousand, nine hundred nine".