56248921 has 4 divisors (see below), whose sum is σ = 56264832. Its totient is φ = 56233012.

The previous prime is 56248897. The next prime is 56248939. The reversal of 56248921 is 12984265.

56248921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

56248921 is a nontrivial binomial coefficient, being equal to C(10607, 2).

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 not a de Polignac number, because 56248921 - 2¹⁹ = 55724633 is a prime.

It is a super-2 number, since 2×56248921² = 6327882227328482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56248321) 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, 1 + ... + 10606.

It is an arithmetic number, because the mean of its divisors is an integer number (14066208).

Almost surely, 2^56248921 is an apocalyptic number.

56248921 is the 10606-th triangular number.

56248921 is the 3536-th centered nonagonal number.

It is an amenable number.

56248921 is a deficient number, since it is larger than the sum of its proper divisors (15911).

56248921 is a wasteful number, since it uses less digits than its factorization.

56248921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15910.

The product of its digits is 34560, while the sum is 37.

The square root of 56248921 is about 7499.9280663217. The cubic root of 56248921 is about 383.1522662615.

The spelling of 56248921 in words is "fifty-six million, two hundred forty-eight thousand, nine hundred twenty-one".