231356161 has 4 divisors (see below), whose sum is σ = 234284800. Its totient is φ = 228427524.

The previous prime is 231356119. The next prime is 231356173. The reversal of 231356161 is 161653132.

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 231356161 - 2¹¹ = 231354113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231356101) 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 3 ways as a sum of consecutive naturals, for example, 1464201 + ... + 1464358.

It is an arithmetic number, because the mean of its divisors is an integer number (58571200).

Almost surely, 2^231356161 is an apocalyptic number.

It is an amenable number.

231356161 is a deficient number, since it is larger than the sum of its proper divisors (2928639).

231356161 is an equidigital number, since it uses as much as digits as its factorization.

231356161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2928638.

The product of its digits is 3240, while the sum is 28.

The square root of 231356161 is about 15210.3964774098. The cubic root of 231356161 is about 613.8944254672.

The spelling of 231356161 in words is "two hundred thirty-one million, three hundred fifty-six thousand, one hundred sixty-one".