865655471 has 2 divisors, whose sum is σ = 865655472. Its totient is φ = 865655470.

The previous prime is 865655459. The next prime is 865655491. The reversal of 865655471 is 174556568.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 865655471 - 2⁶ = 865655407 is a prime.

It is a super-3 number, since 3×865655471³ (a number of 28 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (865655431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432827735 + 432827736.

It is an arithmetic number, because the mean of its divisors is an integer number (432827736).

Almost surely, 2^865655471 is an apocalyptic number.

865655471 is a deficient number, since it is larger than the sum of its proper divisors (1).

865655471 is an equidigital number, since it uses as much as digits as its factorization.

865655471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008000, while the sum is 47.

The square root of 865655471 is about 29422.0235707879. The cubic root of 865655471 is about 953.0485524295.

The spelling of 865655471 in words is "eight hundred sixty-five million, six hundred fifty-five thousand, four hundred seventy-one".