231217 has 16 divisors (see below), whose sum is σ = 293760. Its totient is φ = 177408.

The previous prime is 231197. The next prime is 231223. The reversal of 231217 is 712132.

It is a happy number.

231217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-231217 is a prime.

It is a super-2 number, since 2×231217² = 106922602178, which contains 22 as substring.

231217 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 231217.

It is not an unprimeable number, because it can be changed into a prime (231277) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3418 + ... + 3484.

It is an arithmetic number, because the mean of its divisors is an integer number (18360).

2²³¹²¹⁷ is an apocalyptic number.

It is an amenable number.

231217 is a deficient number, since it is larger than the sum of its proper divisors (62543).

231217 is a wasteful number, since it uses less digits than its factorization.

231217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120.

The product of its digits is 84, while the sum is 16.

The square root of 231217 is about 480.8502885514. The cubic root of 231217 is about 61.3771314710.

Adding to 231217 its reverse (712132), we get a palindrome (943349).

It can be divided in two parts, 2312 and 17, that multiplied together give a cube (39304 = 34³).

The spelling of 231217 in words is "two hundred thirty-one thousand, two hundred seventeen".