231690 has 16 divisors (see below), whose sum is σ = 556128. Its totient is φ = 61776.

The previous prime is 231677. The next prime is 231701. The reversal of 231690 is 96132.

231690 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×231690² = 107360512200, which contains 22 as substring.

It is an unprimeable number.

231690 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 7 ways as a sum of consecutive naturals, for example, 3832 + ... + 3891.

It is an arithmetic number, because the mean of its divisors is an integer number (34758).

2²³¹⁶⁹⁰ is an apocalyptic number.

231690 is an abundant number, since it is smaller than the sum of its proper divisors (324438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231690 is a wasteful number, since it uses less digits than its factorization.

231690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7733.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 231690 is about 481.3418743471. The cubic root of 231690 is about 61.4189559752.

The spelling of 231690 in words is "two hundred thirty-one thousand, six hundred ninety".