231604 has 6 divisors (see below), whose sum is σ = 405314. Its totient is φ = 115800.

The previous prime is 231599. The next prime is 231607. The reversal of 231604 is 406132.

It can be written as a sum of positive squares in only one way, i.e., 168100 + 63504 = 410^2 + 252^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28947 + ... + 28954.

2²³¹⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

231604 is a deficient number, since it is larger than the sum of its proper divisors (173710).

231604 is a wasteful number, since it uses less digits than its factorization.

231604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57905 (or 57903 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 231604 is about 481.2525324609. The cubic root of 231604 is about 61.4113557567.

Adding to 231604 its reverse (406132), we get a palindrome (637736).

The spelling of 231604 in words is "two hundred thirty-one thousand, six hundred four".