266111231 has 2 divisors, whose sum is σ = 266111232. Its totient is φ = 266111230.

The previous prime is 266111201. The next prime is 266111239. The reversal of 266111231 is 132111662.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266111231 is a prime.

It is a super-2 number, since 2×266111231² = 141630374528670722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is equal to p_14511308 and since 266111231 and 14511308 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 266111197 and 266111206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266111239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133055615 + 133055616.

It is an arithmetic number, because the mean of its divisors is an integer number (133055616).

Almost surely, 2^266111231 is an apocalyptic number.

266111231 is a deficient number, since it is larger than the sum of its proper divisors (1).

266111231 is an equidigital number, since it uses as much as digits as its factorization.

266111231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 23.

The square root of 266111231 is about 16312.9160789848. The cubic root of 266111231 is about 643.2123897380.

Adding to 266111231 its reverse (132111662), we get a palindrome (398222893).

The spelling of 266111231 in words is "two hundred sixty-six million, one hundred eleven thousand, two hundred thirty-one".