56218111 has 2 divisors, whose sum is σ = 56218112. Its totient is φ = 56218110.

The previous prime is 56218081. The next prime is 56218171. The reversal of 56218111 is 11181265.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56218111 - 2⁵ = 56218079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56218171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28109055 + 28109056.

It is an arithmetic number, because the mean of its divisors is an integer number (28109056).

Almost surely, 2^56218111 is an apocalyptic number.

56218111 is a deficient number, since it is larger than the sum of its proper divisors (1).

56218111 is an equidigital number, since it uses as much as digits as its factorization.

56218111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480, while the sum is 25.

The square root of 56218111 is about 7497.8737652751. The cubic root of 56218111 is about 383.0822970536.

Adding to 56218111 its reverse (11181265), we get a palindrome (67399376).

It can be divided in two parts, 5 and 6218111, that multiplied together give a triangular number (31090555 = T₇₈₈₅).

The spelling of 56218111 in words is "fifty-six million, two hundred eighteen thousand, one hundred eleven".