51111198 has 24 divisors (see below), whose sum is σ = 115556688. Its totient is φ = 16296192.

The previous prime is 51111191. The next prime is 51111199. The reversal of 51111198 is 89111115.

It is a super-2 number, since 2×51111198² = 5224709121990408, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51111191) 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, 61315 + ... + 62142.

It is an arithmetic number, because the mean of its divisors is an integer number (4814862).

Almost surely, 2^51111198 is an apocalyptic number.

51111198 is an abundant number, since it is smaller than the sum of its proper divisors (64445490).

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

51111198 is a wasteful number, since it uses less digits than its factorization.

51111198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123488 (or 123485 counting only the distinct ones).

The product of its digits is 360, while the sum is 27.

The square root of 51111198 is about 7149.2096066628. The cubic root of 51111198 is about 371.1123041371.

The spelling of 51111198 in words is "fifty-one million, one hundred eleven thousand, one hundred ninety-eight".