231611 has 2 divisors, whose sum is σ = 231612. Its totient is φ = 231610.

The previous prime is 231607. The next prime is 231613. The reversal of 231611 is 116132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231611 - 2² = 231607 is a prime.

Together with 231613, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 231611.

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, 115805 + 115806.

It is an arithmetic number, because the mean of its divisors is an integer number (115806).

2²³¹⁶¹¹ is an apocalyptic number.

231611 is a deficient number, since it is larger than the sum of its proper divisors (1).

231611 is an equidigital number, since it uses as much as digits as its factorization.

231611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36, while the sum is 14.

The square root of 231611 is about 481.2598050949. The cubic root of 231611 is about 61.4119744494.

Adding to 231611 its reverse (116132), we get a palindrome (347743).

It can be divided in two parts, 231 and 611, that multiplied together give a palindrome (141141).

The spelling of 231611 in words is "two hundred thirty-one thousand, six hundred eleven".