231403161 has 16 divisors (see below), whose sum is σ = 351221760. Its totient is φ = 134146320.

The previous prime is 231403153. The next prime is 231403171. The reversal of 231403161 is 161304132.

It is not a de Polignac number, because 231403161 - 2³ = 231403153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231403171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151681 + ... + 153198.

It is an arithmetic number, because the mean of its divisors is an integer number (21951360).

Almost surely, 2^231403161 is an apocalyptic number.

It is an amenable number.

231403161 is a deficient number, since it is larger than the sum of its proper divisors (119818599).

231403161 is a wasteful number, since it uses less digits than its factorization.

231403161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304916.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 231403161 is about 15211.9413948385. The cubic root of 231403161 is about 613.9359935330.

Adding to 231403161 its reverse (161304132), we get a palindrome (392707293).

The spelling of 231403161 in words is "two hundred thirty-one million, four hundred three thousand, one hundred sixty-one".