55111512 has 32 divisors (see below), whose sum is σ = 138444480. Its totient is φ = 18281760.

The previous prime is 55111493. The next prime is 55111517. The reversal of 55111512 is 21511155.

It is a super-2 number, since 2×55111512² = 6074557509852288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55111517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 378 + ... + 10505.

It is an arithmetic number, because the mean of its divisors is an integer number (4326390).

Almost surely, 2^55111512 is an apocalyptic number.

It is an amenable number.

55111512 is an abundant number, since it is smaller than the sum of its proper divisors (83332968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55111512 is a wasteful number, since it uses less digits than its factorization.

55111512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11103 (or 11099 counting only the distinct ones).

The product of its digits is 250, while the sum is 21.

The square root of 55111512 is about 7423.7128177213. The cubic root of 55111512 is about 380.5520876244.

Adding to 55111512 its reverse (21511155), we get a palindrome (76622667).

The spelling of 55111512 in words is "fifty-five million, one hundred eleven thousand, five hundred twelve".