231001131 has 4 divisors (see below), whose sum is σ = 308001512. Its totient is φ = 154000752.

The previous prime is 231001097. The next prime is 231001139. The reversal of 231001131 is 131100132.

231001131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 231001131 - 2⁷ = 231001003 is a prime.

It is a super-2 number, since 2×231001131² = 106723045046558322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231001139) 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, 38500186 + ... + 38500191.

It is an arithmetic number, because the mean of its divisors is an integer number (77000378).

Almost surely, 2^231001131 is an apocalyptic number.

231001131 is a deficient number, since it is larger than the sum of its proper divisors (77000381).

231001131 is an equidigital number, since it uses as much as digits as its factorization.

231001131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77000380.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 231001131 is about 15198.7213606935. The cubic root of 231001131 is about 613.5802453471.

Adding to 231001131 its reverse (131100132), we get a palindrome (362101263).

Subtracting from 231001131 its reverse (131100132), we obtain a palindrome (99900999).

It can be divided in two parts, 231001 and 131, that added together give a palindrome (231132).

The spelling of 231001131 in words is "two hundred thirty-one million, one thousand, one hundred thirty-one".