56551091 has 2 divisors, whose sum is σ = 56551092. Its totient is φ = 56551090.

The previous prime is 56551081. The next prime is 56551109. The reversal of 56551091 is 19015565.

Together with next prime (56551109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56551091 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56551021) 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, 28275545 + 28275546.

It is an arithmetic number, because the mean of its divisors is an integer number (28275546).

Almost surely, 2^56551091 is an apocalyptic number.

56551091 is a deficient number, since it is larger than the sum of its proper divisors (1).

56551091 is an equidigital number, since it uses as much as digits as its factorization.

56551091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6750, while the sum is 32.

The square root of 56551091 is about 7520.0459440086. The cubic root of 56551091 is about 383.8371411355.

The spelling of 56551091 in words is "fifty-six million, five hundred fifty-one thousand, ninety-one".