865742281 has 2 divisors, whose sum is σ = 865742282. Its totient is φ = 865742280.

The previous prime is 865742261. The next prime is 865742327. The reversal of 865742281 is 182247568.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 550324681 + 315417600 = 23459^2 + 17760^2 .

It is a cyclic number.

It is not a de Polignac number, because 865742281 - 2⁹ = 865741769 is a prime.

It is a super-2 number, since 2×865742281² = 1499019394222165922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (865742261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432871140 + 432871141.

It is an arithmetic number, because the mean of its divisors is an integer number (432871141).

Almost surely, 2^865742281 is an apocalyptic number.

It is an amenable number.

865742281 is a deficient number, since it is larger than the sum of its proper divisors (1).

865742281 is an equidigital number, since it uses as much as digits as its factorization.

865742281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 215040, while the sum is 43.

The square root of 865742281 is about 29423.4987892331. The cubic root of 865742281 is about 953.0804093603.

The spelling of 865742281 in words is "eight hundred sixty-five million, seven hundred forty-two thousand, two hundred eighty-one".