Search a number
-
+
231689 = 443523
BaseRepresentation
bin111000100100001001
3102202211002
4320210021
524403224
64544345
71653323
oct704411
9382732
10231689
11149087
12b20b5
13815c3
1460613
15489ae
hex38909

231689 has 4 divisors (see below), whose sum is σ = 232656. Its totient is φ = 230724.

The previous prime is 231677. The next prime is 231701. The reversal of 231689 is 986132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (231677) and next prime (231701).

It is a cyclic number.

It is not a de Polignac number, because 231689 - 28 = 231433 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (231289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182 + ... + 704.

It is an arithmetic number, because the mean of its divisors is an integer number (58164).

2231689 is an apocalyptic number.

It is an amenable number.

231689 is a deficient number, since it is larger than the sum of its proper divisors (967).

231689 is an equidigital number, since it uses as much as digits as its factorization.

231689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 966.

The product of its digits is 2592, while the sum is 29.

The square root of 231689 is about 481.3408355833. The cubic root of 231689 is about 61.4188676114.

The spelling of 231689 in words is "two hundred thirty-one thousand, six hundred eighty-nine".

Divisors: 1 443 523 231689