231121161 has 16 divisors (see below), whose sum is σ = 342995520. Its totient is φ = 153813600.

The previous prime is 231121133. The next prime is 231121183. The reversal of 231121161 is 161121132.

It is not a de Polignac number, because 231121161 - 2¹⁰ = 231120137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231121061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9106 + ... + 23348.

It is an arithmetic number, because the mean of its divisors is an integer number (21437220).

Almost surely, 2^231121161 is an apocalyptic number.

It is an amenable number.

231121161 is a deficient number, since it is larger than the sum of its proper divisors (111874359).

231121161 is a wasteful number, since it uses less digits than its factorization.

231121161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14853 (or 14847 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 231121161 is about 15202.6695353152. The cubic root of 231121161 is about 613.6865006487.

Adding to 231121161 its reverse (161121132), we get a palindrome (392242293).

The spelling of 231121161 in words is "two hundred thirty-one million, one hundred twenty-one thousand, one hundred sixty-one".