236681 has 2 divisors, whose sum is σ = 236682. Its totient is φ = 236680.

The previous prime is 236659. The next prime is 236699. The reversal of 236681 is 186632.

236681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156025 + 80656 = 395^2 + 284^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-236681 is a prime.

It is a super-2 number, since 2×236681² = 112035791522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 236681.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 236681.

It is not a weakly prime, because it can be changed into another prime (236641) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 118340 + 118341.

It is an arithmetic number, because the mean of its divisors is an integer number (118341).

2²³⁶⁶⁸¹ is an apocalyptic number.

It is an amenable number.

236681 is a deficient number, since it is larger than the sum of its proper divisors (1).

236681 is an equidigital number, since it uses as much as digits as its factorization.

236681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 236681 is about 486.4987153118. The cubic root of 236681 is about 61.8568497592.

The spelling of 236681 in words is "two hundred thirty-six thousand, six hundred eighty-one".