2131312133 has 4 divisors (see below), whose sum is σ = 2131447488. Its totient is φ = 2131176780.

The previous prime is 2131312087. The next prime is 2131312163. The reversal of 2131312133 is 3312131312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2131312133 - 2¹⁰ = 2131311109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131312163) 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, 40391 + ... + 76772.

It is an arithmetic number, because the mean of its divisors is an integer number (532861872).

Almost surely, 2^2131312133 is an apocalyptic number.

It is an amenable number.

2131312133 is a deficient number, since it is larger than the sum of its proper divisors (135355).

2131312133 is a wasteful number, since it uses less digits than its factorization.

2131312133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135354.

The product of its digits is 324, while the sum is 20.

The square root of 2131312133 is about 46166.1362147624. The cubic root of 2131312133 is about 1286.9124994570.

Adding to 2131312133 its reverse (3312131312), we get a palindrome (5443443445).

The spelling of 2131312133 in words is "two billion, one hundred thirty-one million, three hundred twelve thousand, one hundred thirty-three".