231289085 has 8 divisors (see below), whose sum is σ = 282783960. Its totient is φ = 181539904.

The previous prime is 231289073. The next prime is 231289111. The reversal of 231289085 is 580982132.

It can be written as a sum of positive squares in 4 ways, for example, as 5508409 + 225780676 = 2347^2 + 15026^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 231289085 - 2¹⁶ = 231223549 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 436130 + ... + 436659.

It is an arithmetic number, because the mean of its divisors is an integer number (35347995).

Almost surely, 2^231289085 is an apocalyptic number.

It is an amenable number.

231289085 is a deficient number, since it is larger than the sum of its proper divisors (51494875).

231289085 is an equidigital number, since it uses as much as digits as its factorization.

231289085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872847.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 231289085 is about 15208.1913783329. The cubic root of 231289085 is about 613.8350918948.

The spelling of 231289085 in words is "two hundred thirty-one million, two hundred eighty-nine thousand, eighty-five".