231989085 has 24 divisors (see below), whose sum is σ = 411469344.
Its totient is φ = 120849120.
The previous prime is 231989081. The next prime is 231989099. The reversal of 231989085 is 580989132.
It is a happy number.
It is not a de Polignac number, because 231989085 - 22 = 231989081 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (45).
It is a Curzon number.
It is a self number, because there is not a number n which added to its sum of digits gives 231989085.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (231989081) by changing a digit.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58011 + ... + 61880.
It is an arithmetic number, because the mean of its divisors is an integer number (17144556).
Almost surely, 2231989085 is an apocalyptic number.
It is an amenable number.
231989085 is a deficient number, since it is larger than the sum of its proper divisors (179480259).
231989085 is a wasteful number, since it uses less digits than its factorization.
231989085 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 119945 (or 119942 counting only the distinct ones).
The product of its (nonzero) digits is 155520, while the sum is 45.
The square root of 231989085 is about 15231.1879050848.
The cubic root of 231989085 is about 614.4537286820.
The spelling of 231989085 in words is "two hundred thirty-one million, nine hundred eighty-nine thousand, eighty-five".