3118991 has 4 divisors (see below), whose sum is σ = 3170184. Its totient is φ = 3067800.

The previous prime is 3118987. The next prime is 3119009. The reversal of 3118991 is 1998113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1998113 = 13 ⋅153701.

It is a cyclic number.

It is not a de Polignac number, because 3118991 - 2² = 3118987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3118901) 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, 25505 + ... + 25626.

It is an arithmetic number, because the mean of its divisors is an integer number (792546).

Almost surely, 2^3118991 is an apocalyptic number.

3118991 is a deficient number, since it is larger than the sum of its proper divisors (51193).

3118991 is an equidigital number, since it uses as much as digits as its factorization.

3118991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51192.

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

The square root of 3118991 is about 1766.0665332880. The cubic root of 3118991 is about 146.1071178623.

The spelling of 3118991 in words is "three million, one hundred eighteen thousand, nine hundred ninety-one".