236981 has 2 divisors, whose sum is σ = 236982. Its totient is φ = 236980.

The previous prime is 236947. The next prime is 236983. The reversal of 236981 is 189632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152881 + 84100 = 391^2 + 290^2 .

It is a cyclic number.

It is not a de Polignac number, because 236981 - 2⁶ = 236917 is a prime.

It is a super-2 number, since 2×236981² = 112319988722, which contains 22 as substring.

Together with 236983, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

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 236981.

It is not a weakly prime, because it can be changed into another prime (236983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 118490 + 118491.

It is an arithmetic number, because the mean of its divisors is an integer number (118491).

2²³⁶⁹⁸¹ is an apocalyptic number.

It is an amenable number.

236981 is a deficient number, since it is larger than the sum of its proper divisors (1).

236981 is an equidigital number, since it uses as much as digits as its factorization.

236981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 29.

The square root of 236981 is about 486.8069432537. The cubic root of 236981 is about 61.8829738389.

The spelling of 236981 in words is "two hundred thirty-six thousand, nine hundred eighty-one".