8201287865 has 4 divisors (see below), whose sum is σ = 9841545444. Its totient is φ = 6561030288.

The previous prime is 8201287837. The next prime is 8201287879. The reversal of 8201287865 is 5687821028.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1014995881 + 7186291984 = 31859^2 + 84772^2 .

It is a cyclic number.

It is not a de Polignac number, because 8201287865 - 2³² = 3906320569 is a prime.

It is a super-2 number, since 2×8201287865² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 820128782 + ... + 820128791.

It is an arithmetic number, because the mean of its divisors is an integer number (2460386361).

Almost surely, 2^8201287865 is an apocalyptic number.

It is an amenable number.

8201287865 is a deficient number, since it is larger than the sum of its proper divisors (1640257579).

8201287865 is a wasteful number, since it uses less digits than its factorization.

8201287865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640257578.

The product of its (nonzero) digits is 430080, while the sum is 47.

The square root of 8201287865 is about 90560.9621470532. The cubic root of 8201287865 is about 2016.6352395288.

The spelling of 8201287865 in words is "eight billion, two hundred one million, two hundred eighty-seven thousand, eight hundred sixty-five".