2031313231 has 4 divisors (see below), whose sum is σ = 2032424464. Its totient is φ = 2030202000.

The previous prime is 2031313217. The next prime is 2031313243. The reversal of 2031313231 is 1323131302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1323131302 = 2 ⋅661565651.

It is a cyclic number.

It is not a de Polignac number, because 2031313231 - 2⁹ = 2031312719 is a prime.

It is a super-2 number, since 2×2031313231² = 8252466884871318722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2031313199 and 2031313208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2031313211) 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, 552870 + ... + 556531.

It is an arithmetic number, because the mean of its divisors is an integer number (508106116).

Almost surely, 2^2031313231 is an apocalyptic number.

2031313231 is a deficient number, since it is larger than the sum of its proper divisors (1111233).

2031313231 is a wasteful number, since it uses less digits than its factorization.

2031313231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111232.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 2031313231 is about 45070.0924228030. The cubic root of 2031313231 is about 1266.4623957839.

Adding to 2031313231 its reverse (1323131302), we get a palindrome (3354444533).

The spelling of 2031313231 in words is "two billion, thirty-one million, three hundred thirteen thousand, two hundred thirty-one".