231290 has 16 divisors (see below), whose sum is σ = 422280. Its totient is φ = 91200.

The previous prime is 231289. The next prime is 231293. The reversal of 231290 is 92132.

It can be written as a sum of positive squares in 4 ways, for example, as 229441 + 1849 = 479^2 + 43^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (231293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 896 + ... + 1124.

2²³¹²⁹⁰ is an apocalyptic number.

231290 is a deficient number, since it is larger than the sum of its proper divisors (190990).

231290 is a wasteful number, since it uses less digits than its factorization.

231290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 231290 is about 480.9261897630. The cubic root of 231290 is about 61.3835901356.

The spelling of 231290 in words is "two hundred thirty-one thousand, two hundred ninety".