56178109 has 4 divisors (see below), whose sum is σ = 60499516. Its totient is φ = 51856704.

The previous prime is 56178097. The next prime is 56178127. The reversal of 56178109 is 90187165.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3572100 + 52606009 = 1890^2 + 7253^2 .

It is a cyclic number.

It is not a de Polignac number, because 56178109 - 2¹⁹ = 55653821 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 (56178209) 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, 2160684 + ... + 2160709.

It is an arithmetic number, because the mean of its divisors is an integer number (15124879).

Almost surely, 2^56178109 is an apocalyptic number.

It is an amenable number.

56178109 is a deficient number, since it is larger than the sum of its proper divisors (4321407).

56178109 is a wasteful number, since it uses less digits than its factorization.

56178109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4321406.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 56178109 is about 7495.2057343344. The cubic root of 56178109 is about 382.9914147512.

The spelling of 56178109 in words is "fifty-six million, one hundred seventy-eight thousand, one hundred nine".