3121032109991 has 16 divisors (see below), whose sum is σ = 3236726630400. Its totient is φ = 3006283831200.

The previous prime is 3121032109981. The next prime is 3121032110029. The reversal of 3121032109991 is 1999012301213.

It is a cyclic number.

It is not a de Polignac number, because 3121032109991 - 2⁶ = 3121032109927 is a prime.

It is a super-3 number, since 3×3121032109991³ (a number of 38 digits) contains 333 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 (3121032109931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24861980 + ... + 24987198.

It is an arithmetic number, because the mean of its divisors is an integer number (202295414400).

Almost surely, 2^{3121032109991} is an apocalyptic number.

3121032109991 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

3121032109991 is a deficient number, since it is larger than the sum of its proper divisors (115694520409).

3121032109991 is a wasteful number, since it uses less digits than its factorization.

3121032109991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128990.

The product of its (nonzero) digits is 26244, while the sum is 41.

The spelling of 3121032109991 in words is "three trillion, one hundred twenty-one billion, thirty-two million, one hundred nine thousand, nine hundred ninety-one".