231304121 has 4 divisors (see below), whose sum is σ = 231440244. Its totient is φ = 231168000.

The previous prime is 231304111. The next prime is 231304189. The reversal of 231304121 is 121403132.

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

It can be written as a sum of positive squares in 2 ways, for example, as 154654096 + 76650025 = 12436^2 + 8755^2 .

It is a cyclic number.

It is not a de Polignac number, because 231304121 - 2¹⁰ = 231303097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231304121.

It is not an unprimeable number, because it can be changed into a prime (231304111) 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, 65480 + ... + 68921.

It is an arithmetic number, because the mean of its divisors is an integer number (57860061).

Almost surely, 2^231304121 is an apocalyptic number.

It is an amenable number.

231304121 is a deficient number, since it is larger than the sum of its proper divisors (136123).

231304121 is a wasteful number, since it uses less digits than its factorization.

231304121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136122.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 231304121 is about 15208.6857091597. The cubic root of 231304121 is about 613.8483933215.

Adding to 231304121 its reverse (121403132), we get a palindrome (352707253).

The spelling of 231304121 in words is "two hundred thirty-one million, three hundred four thousand, one hundred twenty-one".