56551111 has 2 divisors, whose sum is σ = 56551112. Its totient is φ = 56551110.

The previous prime is 56551109. The next prime is 56551141. The reversal of 56551111 is 11115565.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56551111 - 2¹ = 56551109 is a prime.

Together with 56551109, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56551141) 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, 28275555 + 28275556.

It is an arithmetic number, because the mean of its divisors is an integer number (28275556).

Almost surely, 2^56551111 is an apocalyptic number.

56551111 is a deficient number, since it is larger than the sum of its proper divisors (1).

56551111 is an equidigital number, since it uses as much as digits as its factorization.

56551111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 750, while the sum is 25.

The square root of 56551111 is about 7520.0472737876. The cubic root of 56551111 is about 383.8371863851.

Adding to 56551111 its reverse (11115565), we get a palindrome (67666676).

The spelling of 56551111 in words is "fifty-six million, five hundred fifty-one thousand, one hundred eleven".