56551331 has 8 divisors (see below), whose sum is σ = 57631728. Its totient is φ = 55476000.

The previous prime is 56551309. The next prime is 56551337. The reversal of 56551331 is 13315565.

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 56551331 - 2⁶ = 56551267 is a prime.

It is a super-2 number, since 2×56551331² = 6396106075743122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56551294 and 56551303.

It is not an unprimeable number, because it can be changed into a prime (56551337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27116 + ... + 29126.

It is an arithmetic number, because the mean of its divisors is an integer number (7203966).

Almost surely, 2^56551331 is an apocalyptic number.

56551331 is a deficient number, since it is larger than the sum of its proper divisors (1080397).

56551331 is a wasteful number, since it uses less digits than its factorization.

56551331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2533.

The product of its digits is 6750, while the sum is 29.

The square root of 56551331 is about 7520.0619013410. The cubic root of 56551331 is about 383.8376841299.

Adding to 56551331 its reverse (13315565), we get a palindrome (69866896).

The spelling of 56551331 in words is "fifty-six million, five hundred fifty-one thousand, three hundred thirty-one".