3121131091 has 4 divisors (see below), whose sum is σ = 3361218112. Its totient is φ = 2881044072.

The previous prime is 3121131089. The next prime is 3121131107. The reversal of 3121131091 is 1901311213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1901311213 = 1291 ⋅1472743.

It is a cyclic number.

It is not a de Polignac number, because 3121131091 - 2¹ = 3121131089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3121131791) 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, 120043491 + ... + 120043516.

It is an arithmetic number, because the mean of its divisors is an integer number (840304528).

Almost surely, 2^3121131091 is an apocalyptic number.

3121131091 is a deficient number, since it is larger than the sum of its proper divisors (240087021).

3121131091 is a wasteful number, since it uses less digits than its factorization.

3121131091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240087020.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 3121131091 is about 55867.0841462126. The cubic root of 3121131091 is about 1461.4052728212.

The spelling of 3121131091 in words is "three billion, one hundred twenty-one million, one hundred thirty-one thousand, ninety-one".