231617 has 4 divisors (see below), whose sum is σ = 235476. Its totient is φ = 227760.

The previous prime is 231613. The next prime is 231631. The reversal of 231617 is 716132.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5041 + 226576 = 71^2 + 476^2 .

It is a cyclic number.

It is not a de Polignac number, because 231617 - 2² = 231613 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 231617.

It is not an unprimeable number, because it can be changed into a prime (231611) 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, 1838 + ... + 1959.

It is an arithmetic number, because the mean of its divisors is an integer number (58869).

2²³¹⁶¹⁷ is an apocalyptic number.

It is an amenable number.

231617 is a deficient number, since it is larger than the sum of its proper divisors (3859).

231617 is an equidigital number, since it uses as much as digits as its factorization.

231617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3858.

The product of its digits is 252, while the sum is 20.

The square root of 231617 is about 481.2660386938. The cubic root of 231617 is about 61.4125047476.

Adding to 231617 its reverse (716132), we get a palindrome (947749).

It can be divided in two parts, 231 and 617, that added together give a palindrome (848).

The spelling of 231617 in words is "two hundred thirty-one thousand, six hundred seventeen".