866039231 has 2 divisors, whose sum is σ = 866039232. Its totient is φ = 866039230.

The previous prime is 866039227. The next prime is 866039243. The reversal of 866039231 is 132930668.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 866039231 - 2² = 866039227 is a prime.

It is a super-2 number, since 2×866039231² = 1500047899262142722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866039261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433019615 + 433019616.

It is an arithmetic number, because the mean of its divisors is an integer number (433019616).

Almost surely, 2^866039231 is an apocalyptic number.

866039231 is a deficient number, since it is larger than the sum of its proper divisors (1).

866039231 is an equidigital number, since it uses as much as digits as its factorization.

866039231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 866039231 is about 29428.5444933996. The cubic root of 866039231 is about 953.1893659099.

Adding to 866039231 its reverse (132930668), we get a palindrome (998969899).

The spelling of 866039231 in words is "eight hundred sixty-six million, thirty-nine thousand, two hundred thirty-one".