55111312 has 20 divisors (see below), whose sum is σ = 111421440. Its totient is φ = 26357408.

The previous prime is 55111291. The next prime is 55111321. The reversal of 55111312 is 21311155.

It is a super-2 number, since 2×55111312² = 6074513420722688, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55111312.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74512 + ... + 75247.

It is an arithmetic number, because the mean of its divisors is an integer number (5571072).

Almost surely, 2^55111312 is an apocalyptic number.

It is an amenable number.

55111312 is an abundant number, since it is smaller than the sum of its proper divisors (56310128).

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

55111312 is a wasteful number, since it uses less digits than its factorization.

55111312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149790 (or 149784 counting only the distinct ones).

The product of its digits is 150, while the sum is 19.

The square root of 55111312 is about 7423.6993473605. The cubic root of 55111312 is about 380.5516272819.

Adding to 55111312 its reverse (21311155), we get a palindrome (76422467).

The spelling of 55111312 in words is "fifty-five million, one hundred eleven thousand, three hundred twelve".