231642231 has 4 divisors (see below), whose sum is σ = 308856312. Its totient is φ = 154428152.

The previous prime is 231642217. The next prime is 231642233. The reversal of 231642231 is 132246132.

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 231642231 - 2¹⁸ = 231380087 is a prime.

It is a super-2 number, since 2×231642231² = 107316246365314722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231642233) 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, 38607036 + ... + 38607041.

It is an arithmetic number, because the mean of its divisors is an integer number (77214078).

Almost surely, 2^231642231 is an apocalyptic number.

231642231 is a deficient number, since it is larger than the sum of its proper divisors (77214081).

231642231 is an equidigital number, since it uses as much as digits as its factorization.

231642231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77214080.

The product of its digits is 1728, while the sum is 24.

The square root of 231642231 is about 15219.7973376783. The cubic root of 231642231 is about 614.1473463956.

Adding to 231642231 its reverse (132246132), we get a palindrome (363888363).

The spelling of 231642231 in words is "two hundred thirty-one million, six hundred forty-two thousand, two hundred thirty-one".