56155821 has 8 divisors (see below), whose sum is σ = 74962944. Its totient is φ = 37392960.

The previous prime is 56155789. The next prime is 56155831. The reversal of 56155821 is 12855165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 56155821 - 2⁵ = 56155789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56155831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7981 + ... + 13266.

It is an arithmetic number, because the mean of its divisors is an integer number (9370368).

Almost surely, 2^56155821 is an apocalyptic number.

It is an amenable number.

56155821 is a deficient number, since it is larger than the sum of its proper divisors (18807123).

56155821 is a wasteful number, since it uses less digits than its factorization.

56155821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22131.

The product of its digits is 12000, while the sum is 33.

The square root of 56155821 is about 7493.7187697431. The cubic root of 56155821 is about 382.9407589476.

The spelling of 56155821 in words is "fifty-six million, one hundred fifty-five thousand, eight hundred twenty-one".