231201231 has 16 divisors (see below), whose sum is σ = 312729984. Its totient is φ = 151912544.

The previous prime is 231201227. The next prime is 231201283. The reversal of 231201231 is 132102132.

It is a cyclic number.

It is not a de Polignac number, because 231201231 - 2² = 231201227 is a prime.

It is a super-2 number, since 2×231201231² = 106908018431830722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231201231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231201431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137860 + ... + 139526.

It is an arithmetic number, because the mean of its divisors is an integer number (19545624).

Almost surely, 2^231201231 is an apocalyptic number.

231201231 is a deficient number, since it is larger than the sum of its proper divisors (81528753).

231201231 is a wasteful number, since it uses less digits than its factorization.

231201231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2310.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 231201231 is about 15205.3027263518. The cubic root of 231201231 is about 613.7573613241.

Adding to 231201231 its reverse (132102132), we get a palindrome (363303363).

Subtracting from 231201231 its reverse (132102132), we obtain a palindrome (99099099).

The spelling of 231201231 in words is "two hundred thirty-one million, two hundred one thousand, two hundred thirty-one".