111881772 has 18 divisors (see below), whose sum is σ = 282812348. Its totient is φ = 37293912.

The previous prime is 111881767. The next prime is 111881773. The reversal of 111881772 is 277188111.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 3107827 = 111881772 / (1 + 1 + 1 + 8 + 8 + 1 + 7 + 7 + 2).

It is not an unprimeable number, because it can be changed into a prime (111881773) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1553878 + ... + 1553949.

Almost surely, 2^111881772 is an apocalyptic number.

111881772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

111881772 is an abundant number, since it is smaller than the sum of its proper divisors (170930576).

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

111881772 is a wasteful number, since it uses less digits than its factorization.

111881772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3107837 (or 3107832 counting only the distinct ones).

The product of its digits is 6272, while the sum is 36.

The square root of 111881772 is about 10577.4180214266. The cubic root of 111881772 is about 481.8587822266.

The spelling of 111881772 in words is "one hundred eleven million, eight hundred eighty-one thousand, seven hundred seventy-two".