231166121 has 4 divisors (see below), whose sum is σ = 237413892. Its totient is φ = 224918352.

The previous prime is 231166109. The next prime is 231166127. The reversal of 231166121 is 121661132.

231166121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 185940496 + 45225625 = 13636^2 + 6725^2 .

It is a cyclic number.

It is not a de Polignac number, because 231166121 - 2¹⁰ = 231165097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231166127) 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, 3123830 + ... + 3123903.

It is an arithmetic number, because the mean of its divisors is an integer number (59353473).

Almost surely, 2^231166121 is an apocalyptic number.

It is an amenable number.

231166121 is a deficient number, since it is larger than the sum of its proper divisors (6247771).

231166121 is an equidigital number, since it uses as much as digits as its factorization.

231166121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6247770.

The product of its digits is 432, while the sum is 23.

The square root of 231166121 is about 15204.1481510803. The cubic root of 231166121 is about 613.7262915474.

The spelling of 231166121 in words is "two hundred thirty-one million, one hundred sixty-six thousand, one hundred twenty-one".