56155559 has 4 divisors (see below), whose sum is σ = 56832216. Its totient is φ = 55478904.

The previous prime is 56155543. The next prime is 56155591. The reversal of 56155559 is 95555165.

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 56155559 - 2⁴ = 56155543 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 (56151559) 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, 338204 + ... + 338369.

It is an arithmetic number, because the mean of its divisors is an integer number (14208054).

Almost surely, 2^56155559 is an apocalyptic number.

56155559 is a deficient number, since it is larger than the sum of its proper divisors (676657).

56155559 is an equidigital number, since it uses as much as digits as its factorization.

56155559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676656.

The product of its digits is 168750, while the sum is 41.

The square root of 56155559 is about 7493.7012884155. The cubic root of 56155559 is about 382.9401633986.

The spelling of 56155559 in words is "fifty-six million, one hundred fifty-five thousand, five hundred fifty-nine".