231243121 has 4 divisors (see below), whose sum is σ = 236620912. Its totient is φ = 225865332.

The previous prime is 231243113. The next prime is 231243139. The reversal of 231243121 is 121342132.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231243121 - 2³ = 231243113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231243151) 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, 2688831 + ... + 2688916.

It is an arithmetic number, because the mean of its divisors is an integer number (59155228).

Almost surely, 2^231243121 is an apocalyptic number.

It is an amenable number.

231243121 is a deficient number, since it is larger than the sum of its proper divisors (5377791).

231243121 is an equidigital number, since it uses as much as digits as its factorization.

231243121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5377790.

The product of its digits is 288, while the sum is 19.

The square root of 231243121 is about 15206.6801439367. The cubic root of 231243121 is about 613.7944267889.

Adding to 231243121 its reverse (121342132), we get a palindrome (352585253).

The spelling of 231243121 in words is "two hundred thirty-one million, two hundred forty-three thousand, one hundred twenty-one".