3131121131 has 4 divisors (see below), whose sum is σ = 3295917000. Its totient is φ = 2966325264.

The previous prime is 3131121127. The next prime is 3131121137. The reversal of 3131121131 is 1311211313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1311211313 = 193 ⋅6793841.

It is a cyclic number.

It is not a de Polignac number, because 3131121131 - 2² = 3131121127 is a prime.

It is a super-2 number, since 2×3131121131² = 19607839073989438322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3131121137) 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, 82397906 + ... + 82397943.

It is an arithmetic number, because the mean of its divisors is an integer number (823979250).

Almost surely, 2^3131121131 is an apocalyptic number.

3131121131 is a deficient number, since it is larger than the sum of its proper divisors (164795869).

3131121131 is a wasteful number, since it uses less digits than its factorization.

3131121131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164795868.

The product of its digits is 54, while the sum is 17.

The square root of 3131121131 is about 55956.4217136872. The cubic root of 3131121131 is about 1462.9628222881.

Adding to 3131121131 its reverse (1311211313), we get a palindrome (4442332444).

It can be divided in two parts, 3 and 131121131, that multiplied together give a palindrome (393363393).

The spelling of 3131121131 in words is "three billion, one hundred thirty-one million, one hundred twenty-one thousand, one hundred thirty-one".