231856161 has 8 divisors (see below), whose sum is σ = 319113984. Its totient is φ = 149584560.

The previous prime is 231856159. The next prime is 231856199. The reversal of 231856161 is 161658132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 231856161 - 2¹ = 231856159 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231856151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1246446 + ... + 1246631.

It is an arithmetic number, because the mean of its divisors is an integer number (39889248).

Almost surely, 2^231856161 is an apocalyptic number.

It is an amenable number.

231856161 is a deficient number, since it is larger than the sum of its proper divisors (87257823).

231856161 is a wasteful number, since it uses less digits than its factorization.

231856161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2493111.

The product of its digits is 8640, while the sum is 33.

The square root of 231856161 is about 15226.8237331362. The cubic root of 231856161 is about 614.3363506715.

The spelling of 231856161 in words is "two hundred thirty-one million, eight hundred fifty-six thousand, one hundred sixty-one".