231275161 has 4 divisors (see below), whose sum is σ = 249065572. Its totient is φ = 213484752.

The previous prime is 231275147. The next prime is 231275183. The reversal of 231275161 is 161572132.

It is a happy number.

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 106729561 + 124545600 = 10331^2 + 11160^2 .

It is not a de Polignac number, because 231275161 - 2⁹ = 231274649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231275141) 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, 8895186 + ... + 8895211.

It is an arithmetic number, because the mean of its divisors is an integer number (62266393).

Almost surely, 2^231275161 is an apocalyptic number.

It is an amenable number.

231275161 is a deficient number, since it is larger than the sum of its proper divisors (17790411).

231275161 is a wasteful number, since it uses less digits than its factorization.

231275161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17790410.

The product of its digits is 2520, while the sum is 28.

The square root of 231275161 is about 15207.7335918275. The cubic root of 231275161 is about 613.8227736721.

The spelling of 231275161 in words is "two hundred thirty-one million, two hundred seventy-five thousand, one hundred sixty-one".