2131201331 has 4 divisors (see below), whose sum is σ = 2435658672. Its totient is φ = 1826743992.

The previous prime is 2131201309. The next prime is 2131201337. The reversal of 2131201331 is 1331021312.

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 2131201331 - 2¹⁴ = 2131184947 is a prime.

It is a super-2 number, since 2×2131201331² = 9084038226512343122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2131201337) 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, 152228660 + ... + 152228673.

It is an arithmetic number, because the mean of its divisors is an integer number (608914668).

Almost surely, 2^2131201331 is an apocalyptic number.

2131201331 is a deficient number, since it is larger than the sum of its proper divisors (304457341).

2131201331 is an equidigital number, since it uses as much as digits as its factorization.

2131201331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304457340.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 2131201331 is about 46164.9361637163. The cubic root of 2131201331 is about 1286.8901978668.

Adding to 2131201331 its reverse (1331021312), we get a palindrome (3462222643).

The spelling of 2131201331 in words is "two billion, one hundred thirty-one million, two hundred one thousand, three hundred thirty-one".