231085 has 8 divisors (see below), whose sum is σ = 280440. Its totient is φ = 182784.

The previous prime is 231079. The next prime is 231107. The reversal of 231085 is 580132.

231085 = T₃₉₁ + T₃₉₂ + T₃₉₃.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 12996 + 218089 = 114^2 + 467^2 .

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 231085 - 2⁵ = 231053 is a prime.

231085 is a lucky number.

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, 361 + ... + 769.

It is an arithmetic number, because the mean of its divisors is an integer number (35055).

2²³¹⁰⁸⁵ is an apocalyptic number.

231085 is the 393-rd centered triangular number.

It is an amenable number.

231085 is a deficient number, since it is larger than the sum of its proper divisors (49355).

231085 is a wasteful number, since it uses less digits than its factorization.

231085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 231085 is about 480.7130120977. The cubic root of 231085 is about 61.3654493375.

The spelling of 231085 in words is "two hundred thirty-one thousand, eighty-five".