8243187265 has 8 divisors (see below), whose sum is σ = 10159171560. Its totient is φ = 6416318592.

The previous prime is 8243187257. The next prime is 8243187287. The reversal of 8243187265 is 5627813428.

It is a Cunningham number, because it is equal to 90792²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 2967634576 + 5275552689 = 54476^2 + 72633^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8243187265 - 2³ = 8243187257 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22278700 + ... + 22279069.

It is an arithmetic number, because the mean of its divisors is an integer number (1269896445).

Almost surely, 2^8243187265 is an apocalyptic number.

It is an amenable number.

8243187265 is a deficient number, since it is larger than the sum of its proper divisors (1915984295).

8243187265 is a wasteful number, since it uses less digits than its factorization.

8243187265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44557811.

The product of its digits is 645120, while the sum is 46.

The square root of 8243187265 is about 90792.0000055071. Note that the first 5 decimals coincide. The cubic root of 8243187265 is about 2020.0636571940.

The spelling of 8243187265 in words is "eight billion, two hundred forty-three million, one hundred eighty-seven thousand, two hundred sixty-five".