55631111 has 2 divisors, whose sum is σ = 55631112. Its totient is φ = 55631110.

The previous prime is 55631101. The next prime is 55631153. The reversal of 55631111 is 11113655.

55631111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55631111 is a prime.

It is a super-2 number, since 2×55631111² = 6189641022188642, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55631101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27815555 + 27815556.

It is an arithmetic number, because the mean of its divisors is an integer number (27815556).

Almost surely, 2^55631111 is an apocalyptic number.

55631111 is a deficient number, since it is larger than the sum of its proper divisors (1).

55631111 is an equidigital number, since it uses as much as digits as its factorization.

55631111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 450, while the sum is 23.

The square root of 55631111 is about 7458.6266162076. The cubic root of 55631111 is about 381.7443146134.

Adding to 55631111 its reverse (11113655), we get a palindrome (66744766).

The spelling of 55631111 in words is "fifty-five million, six hundred thirty-one thousand, one hundred eleven".