55111831 has 16 divisors (see below), whose sum is σ = 58899456. Its totient is φ = 51480000.

The previous prime is 55111801. The next prime is 55111843. The reversal of 55111831 is 13811155.

55111831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 55111831 - 2¹⁷ = 54980759 is a prime.

It is a super-2 number, since 2×55111831² = 6074627832345122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55111796 and 55111805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55111801) 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 in 15 ways as a sum of consecutive naturals, for example, 166336 + ... + 166666.

It is an arithmetic number, because the mean of its divisors is an integer number (3681216).

Almost surely, 2^55111831 is an apocalyptic number.

55111831 is a deficient number, since it is larger than the sum of its proper divisors (3787625).

55111831 is a wasteful number, since it uses less digits than its factorization.

55111831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534.

The product of its digits is 600, while the sum is 25.

The square root of 55111831 is about 7423.7343028964. The cubic root of 55111831 is about 380.5528218683.

Adding to 55111831 its reverse (13811155), we get a palindrome (68922986).

The spelling of 55111831 in words is "fifty-five million, one hundred eleven thousand, eight hundred thirty-one".