111531456172 has 24 divisors (see below), whose sum is σ = 198244889136. Its totient is φ = 54894911808.

The previous prime is 111531456161. The next prime is 111531456199. The reversal of 111531456172 is 271654135111.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 514423 + ... + 698350.

It is an arithmetic number, because the mean of its divisors is an integer number (8260203714).

Almost surely, 2^111531456172 is an apocalyptic number.

It is an amenable number.

111531456172 is a deficient number, since it is larger than the sum of its proper divisors (86713432964).

111531456172 is a wasteful number, since it uses less digits than its factorization.

111531456172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213137 (or 1213135 counting only the distinct ones).

The product of its digits is 25200, while the sum is 37.

The spelling of 111531456172 in words is "one hundred eleven billion, five hundred thirty-one million, four hundred fifty-six thousand, one hundred seventy-two".