231130121 has 4 divisors (see below), whose sum is σ = 231181572. Its totient is φ = 231078672.

The previous prime is 231130111. The next prime is 231130127. The reversal of 231130121 is 121031132.

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 101284096 + 129846025 = 10064^2 + 11395^2 .

It is a cyclic number.

It is not a de Polignac number, because 231130121 - 2⁶ = 231130057 is a prime.

It is a super-2 number, since 2×231130121² = 106842265666949282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231130096 and 231130105.

It is not an unprimeable number, because it can be changed into a prime (231130127) 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, 18266 + ... + 28211.

It is an arithmetic number, because the mean of its divisors is an integer number (57795393).

Almost surely, 2^231130121 is an apocalyptic number.

It is an amenable number.

231130121 is a deficient number, since it is larger than the sum of its proper divisors (51451).

231130121 is an equidigital number, since it uses as much as digits as its factorization.

231130121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51450.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 231130121 is about 15202.9642175465. The cubic root of 231130121 is about 613.6944309192.

Adding to 231130121 its reverse (121031132), we get a palindrome (352161253).

The spelling of 231130121 in words is "two hundred thirty-one million, one hundred thirty thousand, one hundred twenty-one".