56551109 has 2 divisors, whose sum is σ = 56551110. Its totient is φ = 56551108.

The previous prime is 56551091. The next prime is 56551111. The reversal of 56551109 is 90115565.

Together with previous prime (56551091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46922500 + 9628609 = 6850^2 + 3103^2 .

It is a cyclic number.

It is not a de Polignac number, because 56551109 - 2²⁰ = 55502533 is a prime.

Together with 56551111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56551009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28275554 + 28275555.

It is an arithmetic number, because the mean of its divisors is an integer number (28275555).

Almost surely, 2^56551109 is an apocalyptic number.

It is an amenable number.

56551109 is a deficient number, since it is larger than the sum of its proper divisors (1).

56551109 is an equidigital number, since it uses as much as digits as its factorization.

56551109 is an evil number, because the sum of its binary digits is even.

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

The square root of 56551109 is about 7520.0471408097. The cubic root of 56551109 is about 383.8371818601.

The spelling of 56551109 in words is "fifty-six million, five hundred fifty-one thousand, one hundred nine".