2131243431 has 4 divisors (see below), whose sum is σ = 2841657912. Its totient is φ = 1420828952.

The previous prime is 2131243421. The next prime is 2131243447. The reversal of 2131243431 is 1343421312.

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 2131243431 - 2⁵ = 2131243399 is a prime.

It is a super-2 number, since 2×2131243431² = 9084397124361303522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131243421) 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, 355207236 + ... + 355207241.

It is an arithmetic number, because the mean of its divisors is an integer number (710414478).

Almost surely, 2^2131243431 is an apocalyptic number.

2131243431 is a deficient number, since it is larger than the sum of its proper divisors (710414481).

2131243431 is an equidigital number, since it uses as much as digits as its factorization.

2131243431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710414480.

The product of its digits is 1728, while the sum is 24.

The square root of 2131243431 is about 46165.3921352348. The cubic root of 2131243431 is about 1286.8986716041.

Adding to 2131243431 its reverse (1343421312), we get a palindrome (3474664743).

The spelling of 2131243431 in words is "two billion, one hundred thirty-one million, two hundred forty-three thousand, four hundred thirty-one".