56155321 has 8 divisors (see below), whose sum is σ = 56617704. Its totient is φ = 55695360.

The previous prime is 56155303. The next prime is 56155361. The reversal of 56155321 is 12355165.

It can be written as a sum of positive squares in 4 ways, for example, as 9369721 + 46785600 = 3061^2 + 6840^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 56155321 - 2⁷ = 56155193 is a prime.

It is a super-2 number, since 2×56155321² = 6306840153226082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56155321.

It is not an unprimeable number, because it can be changed into a prime (56155361) 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, 94401 + ... + 94993.

It is an arithmetic number, because the mean of its divisors is an integer number (7077213).

Almost surely, 2^56155321 is an apocalyptic number.

It is an amenable number.

56155321 is a deficient number, since it is larger than the sum of its proper divisors (462383).

56155321 is a wasteful number, since it uses less digits than its factorization.

56155321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211.

The product of its digits is 4500, while the sum is 28.

The square root of 56155321 is about 7493.6854083955. The cubic root of 56155321 is about 382.9396224020.

The spelling of 56155321 in words is "fifty-six million, one hundred fifty-five thousand, three hundred twenty-one".