82111231 has 2 divisors, whose sum is σ = 82111232. Its totient is φ = 82111230.

The previous prime is 82111223. The next prime is 82111259. The reversal of 82111231 is 13211128.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 82111231 - 2³ = 82111223 is a prime.

It is a super-2 number, since 2×82111231² = 13484508512670722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 82111199 and 82111208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82111201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41055615 + 41055616.

It is an arithmetic number, because the mean of its divisors is an integer number (41055616).

Almost surely, 2^82111231 is an apocalyptic number.

82111231 is a deficient number, since it is larger than the sum of its proper divisors (1).

82111231 is an equidigital number, since it uses as much as digits as its factorization.

82111231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 19.

The square root of 82111231 is about 9061.5247613191. The cubic root of 82111231 is about 434.6444992611.

Adding to 82111231 its reverse (13211128), we get a palindrome (95322359).

The spelling of 82111231 in words is "eighty-two million, one hundred eleven thousand, two hundred thirty-one".