231541231 has 4 divisors (see below), whose sum is σ = 233928352. Its totient is φ = 229154112.

The previous prime is 231541229. The next prime is 231541237. The reversal of 231541231 is 132145132.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 231541231 - 2¹ = 231541229 is a prime.

It is a super-2 number, since 2×231541231² = 107222683305990722, which 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 (231541237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1193415 + ... + 1193608.

It is an arithmetic number, because the mean of its divisors is an integer number (58482088).

Almost surely, 2^231541231 is an apocalyptic number.

231541231 is a deficient number, since it is larger than the sum of its proper divisors (2387121).

231541231 is an equidigital number, since it uses as much as digits as its factorization.

231541231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2387120.

The product of its digits is 720, while the sum is 22.

The square root of 231541231 is about 15216.4789291084. The cubic root of 231541231 is about 614.0580738147.

Adding to 231541231 its reverse (132145132), we get a palindrome (363686363).

The spelling of 231541231 in words is "two hundred thirty-one million, five hundred forty-one thousand, two hundred thirty-one".