231131113231 has 8 divisors (see below), whose sum is σ = 231576818544. Its totient is φ = 230685533760.

The previous prime is 231131113219. The next prime is 231131113243. The reversal of 231131113231 is 132311131132.

It is an interprime number because it is at equal distance from previous prime (231131113219) and next prime (231131113243).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231131113231 - 2¹³ = 231131105039 is a prime.

It is a super-2 number, since 2×231131113231² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231131113211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4184365 + ... + 4239241.

It is an arithmetic number, because the mean of its divisors is an integer number (28947102318).

Almost surely, 2^231131113231 is an apocalyptic number.

231131113231 is a deficient number, since it is larger than the sum of its proper divisors (445705313).

231131113231 is an equidigital number, since it uses as much as digits as its factorization.

231131113231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62921.

The product of its digits is 324, while the sum is 22.

Adding to 231131113231 its reverse (132311131132), we get a palindrome (363442244363).

The spelling of 231131113231 in words is "two hundred thirty-one billion, one hundred thirty-one million, one hundred thirteen thousand, two hundred thirty-one".