56242509 has 4 divisors (see below), whose sum is σ = 74990016. Its totient is φ = 37495004.

The previous prime is 56242499. The next prime is 56242523. The reversal of 56242509 is 90524265.

56242509 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.

It is a cyclic number.

It is not a de Polignac number, because 56242509 - 2⁴ = 56242493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56242509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56242559) 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, 9373749 + ... + 9373754.

It is an arithmetic number, because the mean of its divisors is an integer number (18747504).

Almost surely, 2^56242509 is an apocalyptic number.

It is an amenable number.

56242509 is a deficient number, since it is larger than the sum of its proper divisors (18747507).

56242509 is a wasteful number, since it uses less digits than its factorization.

56242509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18747506.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 56242509 is about 7499.5005833722. The cubic root of 56242509 is about 383.1377067781.

It can be divided in two parts, 562 and 42509, that added together give a triangular number (43071 = T₂₉₃).

The spelling of 56242509 in words is "fifty-six million, two hundred forty-two thousand, five hundred nine".