3122111988 has 18 divisors (see below), whose sum is σ = 7892005394. Its totient is φ = 1040703984.

The previous prime is 3122111983. The next prime is 3122111989. The reversal of 3122111988 is 8891112213.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2171746404 + 950365584 = 46602^2 + 30828^2 .

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

It is a super-2 number, since 2×3122111988² = 19495166531226624288, which contains 22 as substring.

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: 86725333 = 3122111988 / (3 + 1 + 2 + 2 + 1 + 1 + 1 + 9 + 8 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3122111983) 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, 43362631 + ... + 43362702.

Almost surely, 2^3122111988 is an apocalyptic number.

It is an amenable number.

3122111988 is an abundant number, since it is smaller than the sum of its proper divisors (4769893406).

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

3122111988 is a wasteful number, since it uses less digits than its factorization.

3122111988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86725343 (or 86725338 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 3122111988 is about 55875.8623020710. The cubic root of 3122111988 is about 1461.5583517171.

The spelling of 3122111988 in words is "three billion, one hundred twenty-two million, one hundred eleven thousand, nine hundred eighty-eight".