231203161 has 4 divisors (see below), whose sum is σ = 264232192. Its totient is φ = 198174132.

The previous prime is 231203149. The next prime is 231203171. The reversal of 231203161 is 161302132.

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 231203161 - 2⁵ = 231203129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231203171) 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, 16514505 + ... + 16514518.

It is an arithmetic number, because the mean of its divisors is an integer number (66058048).

Almost surely, 2^231203161 is an apocalyptic number.

It is an amenable number.

231203161 is a deficient number, since it is larger than the sum of its proper divisors (33029031).

231203161 is an equidigital number, since it uses as much as digits as its factorization.

231203161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33029030.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 231203161 is about 15205.3661909209. The cubic root of 231203161 is about 613.7590691415.

Adding to 231203161 its reverse (161302132), we get a palindrome (392505293).

The spelling of 231203161 in words is "two hundred thirty-one million, two hundred three thousand, one hundred sixty-one".