56090909 has 4 divisors (see below), whose sum is σ = 64103904. Its totient is φ = 48077916.

The previous prime is 56090899. The next prime is 56090917. The reversal of 56090909 is 90909065.

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-56090909 is a prime.

It is a Duffinian number.

56090909 is a modest number, since divided by 90909 gives 56 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56090989) 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, 4006487 + ... + 4006500.

It is an arithmetic number, because the mean of its divisors is an integer number (16025976).

Almost surely, 2^56090909 is an apocalyptic number.

It is an amenable number.

56090909 is a deficient number, since it is larger than the sum of its proper divisors (8012995).

56090909 is an equidigital number, since it uses as much as digits as its factorization.

56090909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8012994.

The product of its (nonzero) digits is 21870, while the sum is 38.

The square root of 56090909 is about 7489.3864234662. The cubic root of 56090909 is about 382.7931516052.

The spelling of 56090909 in words is "fifty-six million, ninety thousand, nine hundred nine".