3131312111 has 4 divisors (see below), whose sum is σ = 3133112424. Its totient is φ = 3129511800.

The previous prime is 3131312101. The next prime is 3131312117. The reversal of 3131312111 is 1112131313.

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

It is a cyclic number.

It is not a de Polignac number, because 3131312111 - 2¹⁸ = 3131049967 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3131312111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3131312117) 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, 897545 + ... + 901026.

It is an arithmetic number, because the mean of its divisors is an integer number (783278106).

Almost surely, 2^3131312111 is an apocalyptic number.

3131312111 is a deficient number, since it is larger than the sum of its proper divisors (1800313).

3131312111 is a wasteful number, since it uses less digits than its factorization.

3131312111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1800312.

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

The square root of 3131312111 is about 55958.1281942132. The cubic root of 3131312111 is about 1462.9925657301.

Adding to 3131312111 its reverse (1112131313), we get a palindrome (4243443424).

The spelling of 3131312111 in words is "three billion, one hundred thirty-one million, three hundred twelve thousand, one hundred eleven".