231001211231 has 16 divisors (see below), whose sum is σ = 279553559616. Its totient is φ = 186338797056.

The previous prime is 231001211227. The next prime is 231001211237. The reversal of 231001211231 is 132112100132.

It is a cyclic number.

It is not a de Polignac number, because 231001211231 - 2² = 231001211227 is a prime.

It is a super-2 number, since 2×231001211231² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231001211237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1531745 + ... + 1675781.

It is an arithmetic number, because the mean of its divisors is an integer number (17472097476).

Almost surely, 2^231001211231 is an apocalyptic number.

231001211231 is a deficient number, since it is larger than the sum of its proper divisors (48552348385).

231001211231 is a wasteful number, since it uses less digits than its factorization.

231001211231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157538.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 231001211231 its reverse (132112100132), we get a palindrome (363113311363).

The spelling of 231001211231 in words is "two hundred thirty-one billion, one million, two hundred eleven thousand, two hundred thirty-one".