3111989 has 4 divisors (see below), whose sum is σ = 3122124. Its totient is φ = 3101856.

The previous prime is 3111973. The next prime is 3112007. The reversal of 3111989 is 9891113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9891113 = 313 ⋅31601.

It can be written as a sum of positive squares in 2 ways, for example, as 1800964 + 1311025 = 1342^2 + 1145^2 .

It is a cyclic number.

It is not a de Polignac number, because 3111989 - 2⁴ = 3111973 is a prime.

It is a super-2 number, since 2×3111989² = 19368951072242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3114989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4592 + ... + 5225.

It is an arithmetic number, because the mean of its divisors is an integer number (780531).

Almost surely, 2^3111989 is an apocalyptic number.

It is an amenable number.

3111989 is a deficient number, since it is larger than the sum of its proper divisors (10135).

3111989 is an equidigital number, since it uses as much as digits as its factorization.

3111989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10134.

The product of its digits is 1944, while the sum is 32.

The square root of 3111989 is about 1764.0830479317. The cubic root of 3111989 is about 145.9977012211.

The spelling of 3111989 in words is "three million, one hundred eleven thousand, nine hundred eighty-nine".