865669247 has 2 divisors, whose sum is σ = 865669248. Its totient is φ = 865669246.

The previous prime is 865669229. The next prime is 865669253. The reversal of 865669247 is 742966568.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 865669247 - 2²⁶ = 798560383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (865669297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432834623 + 432834624.

It is an arithmetic number, because the mean of its divisors is an integer number (432834624).

Almost surely, 2^865669247 is an apocalyptic number.

865669247 is a deficient number, since it is larger than the sum of its proper divisors (1).

865669247 is an equidigital number, since it uses as much as digits as its factorization.

865669247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 53.

The square root of 865669247 is about 29422.2576801985. The cubic root of 865669247 is about 953.0536079924.

The spelling of 865669247 in words is "eight hundred sixty-five million, six hundred sixty-nine thousand, two hundred forty-seven".