55111311 has 12 divisors (see below), whose sum is σ = 79676688. Its totient is φ = 36707904.

The previous prime is 55111291. The next prime is 55111321. The reversal of 55111311 is 11311155.

55111311 is a `hidden beast` number, since 551 + 113 + 1 + 1 = 666.

It is not a de Polignac number, because 55111311 - 2⁶ = 55111247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55111321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12006 + ... + 15948.

It is an arithmetic number, because the mean of its divisors is an integer number (6639724).

Almost surely, 2^55111311 is an apocalyptic number.

55111311 is a deficient number, since it is larger than the sum of its proper divisors (24565377).

55111311 is a wasteful number, since it uses less digits than its factorization.

55111311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5502 (or 5499 counting only the distinct ones).

The product of its digits is 75, while the sum is 18.

The square root of 55111311 is about 7423.6992800086. The cubic root of 55111311 is about 380.5516249802.

Adding to 55111311 its reverse (11311155), we get a palindrome (66422466).

The spelling of 55111311 in words is "fifty-five million, one hundred eleven thousand, three hundred eleven".