56102809 has 4 divisors (see below), whose sum is σ = 64117504. Its totient is φ = 48088116.

The previous prime is 56102803. The next prime is 56102833. The reversal of 56102809 is 90820165.

56102809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 90820165 = 5 ⋅18164033.

It is a cyclic number.

It is not a de Polignac number, because 56102809 - 2⁹ = 56102297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56102803) 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 3 ways as a sum of consecutive naturals, for example, 4007337 + ... + 4007350.

It is an arithmetic number, because the mean of its divisors is an integer number (16029376).

Almost surely, 2^56102809 is an apocalyptic number.

It is an amenable number.

56102809 is a deficient number, since it is larger than the sum of its proper divisors (8014695).

56102809 is an equidigital number, since it uses as much as digits as its factorization.

56102809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8014694.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 56102809 is about 7490.1808389384. The cubic root of 56102809 is about 382.8202202602.

The spelling of 56102809 in words is "fifty-six million, one hundred two thousand, eight hundred nine".