2111312131 has 4 divisors (see below), whose sum is σ = 2117396952. Its totient is φ = 2105227312.

The previous prime is 2111312087. The next prime is 2111312153. The reversal of 2111312131 is 1312131112.

It is a happy number.

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 2111312131 - 2⁹ = 2111311619 is a prime.

It is a super-2 number, since 2×2111312131² = 8915277829015522322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2111312171) 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, 3041890 + ... + 3042583.

It is an arithmetic number, because the mean of its divisors is an integer number (529349238).

Almost surely, 2^2111312131 is an apocalyptic number.

2111312131 is a deficient number, since it is larger than the sum of its proper divisors (6084821).

2111312131 is an equidigital number, since it uses as much as digits as its factorization.

2111312131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6084820.

The product of its digits is 36, while the sum is 16.

The square root of 2111312131 is about 45949.0166488903. The cubic root of 2111312131 is about 1282.8744262528.

Adding to 2111312131 its reverse (1312131112), we get a palindrome (3423443243).

The spelling of 2111312131 in words is "two billion, one hundred eleven million, three hundred twelve thousand, one hundred thirty-one".