231323287 has 4 divisors (see below), whose sum is σ = 249117400. Its totient is φ = 213529176.

The previous prime is 231323269. The next prime is 231323299. The reversal of 231323287 is 782323132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231323287 - 2⁷ = 231323159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231323087) 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 3 ways as a sum of consecutive naturals, for example, 8897037 + ... + 8897062.

It is an arithmetic number, because the mean of its divisors is an integer number (62279350).

Almost surely, 2^231323287 is an apocalyptic number.

231323287 is a deficient number, since it is larger than the sum of its proper divisors (17794113).

231323287 is a wasteful number, since it uses less digits than its factorization.

231323287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17794112.

The product of its digits is 12096, while the sum is 31.

The square root of 231323287 is about 15209.3157965768. The cubic root of 231323287 is about 613.8653474702.

It can be divided in two parts, 2313 and 23287, that added together give a square (25600 = 160²).

The spelling of 231323287 in words is "two hundred thirty-one million, three hundred twenty-three thousand, two hundred eighty-seven".