3121031091 has 4 divisors (see below), whose sum is σ = 4161374792. Its totient is φ = 2080687392.

The previous prime is 3121031057. The next prime is 3121031129. The reversal of 3121031091 is 1901301213.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 3121031091 - 2⁷ = 3121030963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3121031791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 520171846 + ... + 520171851.

It is an arithmetic number, because the mean of its divisors is an integer number (1040343698).

Almost surely, 2^3121031091 is an apocalyptic number.

3121031091 is a deficient number, since it is larger than the sum of its proper divisors (1040343701).

3121031091 is a wasteful number, since it uses less digits than its factorization.

3121031091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040343700.

The product of its (nonzero) digits is 162, while the sum is 21.

The square root of 3121031091 is about 55866.1891576649. The cubic root of 3121031091 is about 1461.3896650086.

The spelling of 3121031091 in words is "three billion, one hundred twenty-one million, thirty-one thousand, ninety-one".