56221031 has 2 divisors, whose sum is σ = 56221032. Its totient is φ = 56221030.

The previous prime is 56221027. The next prime is 56221037. The reversal of 56221031 is 13012265.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56221031 - 2² = 56221027 is a prime.

It is a super-2 number, since 2×56221031² = 6321608653405922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 56220994 and 56221012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56221037) 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 as a sum of consecutive naturals, namely, 28110515 + 28110516.

It is an arithmetic number, because the mean of its divisors is an integer number (28110516).

Almost surely, 2^56221031 is an apocalyptic number.

56221031 is a deficient number, since it is larger than the sum of its proper divisors (1).

56221031 is an equidigital number, since it uses as much as digits as its factorization.

56221031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 56221031 is about 7498.0684846166. The cubic root of 56221031 is about 383.0889294414.

Adding to 56221031 its reverse (13012265), we get a palindrome (69233296).

The spelling of 56221031 in words is "fifty-six million, two hundred twenty-one thousand, thirty-one".