56451919 has 4 divisors (see below), whose sum is σ = 56527840. Its totient is φ = 56376000.

The previous prime is 56451911. The next prime is 56451929. The reversal of 56451919 is 91915465.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56451919 - 2³ = 56451911 is a prime.

It is a super-2 number, since 2×56451919² = 6373638317565122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56451911) 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, 36834 + ... + 38335.

It is an arithmetic number, because the mean of its divisors is an integer number (14131960).

Almost surely, 2^56451919 is an apocalyptic number.

56451919 is a deficient number, since it is larger than the sum of its proper divisors (75921).

56451919 is an equidigital number, since it uses as much as digits as its factorization.

56451919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75920.

The product of its digits is 48600, while the sum is 40.

The square root of 56451919 is about 7513.4492079204. The cubic root of 56451919 is about 383.6126351788.

The spelling of 56451919 in words is "fifty-six million, four hundred fifty-one thousand, nine hundred nineteen".