56542909 has 4 divisors (see below), whose sum is σ = 57339360. Its totient is φ = 55746460.

The previous prime is 56542903. The next prime is 56542921. The reversal of 56542909 is 90924565.

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 not a de Polignac number, because 56542909 - 2⁵ = 56542877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56542903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398119 + ... + 398260.

It is an arithmetic number, because the mean of its divisors is an integer number (14334840).

Almost surely, 2^56542909 is an apocalyptic number.

It is an amenable number.

56542909 is a deficient number, since it is larger than the sum of its proper divisors (796451).

56542909 is an equidigital number, since it uses as much as digits as its factorization.

56542909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796450.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 56542909 is about 7519.5019116960. The cubic root of 56542909 is about 383.8186286311.

The spelling of 56542909 in words is "fifty-six million, five hundred forty-two thousand, nine hundred nine".