231643 has 2 divisors, whose sum is σ = 231644. Its totient is φ = 231642.

The previous prime is 231631. The next prime is 231661. The reversal of 231643 is 346132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231643 - 2⁵ = 231611 is a prime.

It is equal to p₂₀₅₇₅ and since 231643 and 20575 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231643.

It is not a weakly prime, because it can be changed into another prime (231613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115821 + 115822.

It is an arithmetic number, because the mean of its divisors is an integer number (115822).

2²³¹⁶⁴³ is an apocalyptic number.

231643 is a deficient number, since it is larger than the sum of its proper divisors (1).

231643 is an equidigital number, since it uses as much as digits as its factorization.

231643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 19.

The square root of 231643 is about 481.2930500225. The cubic root of 231643 is about 61.4148026005.

Adding to 231643 its reverse (346132), we get a palindrome (577775).

The spelling of 231643 in words is "two hundred thirty-one thousand, six hundred forty-three".