1159712865 has 12 divisors (see below), whose sum is σ = 2010169044. Its totient is φ = 618513504.

The previous prime is 1159712843. The next prime is 1159712933. The reversal of 1159712865 is 5682179511.

It can be written as a sum of positive squares in 2 ways, for example, as 897661521 + 262051344 = 29961^2 + 16188^2 .

It is not a de Polignac number, because 1159712865 - 2¹² = 1159708769 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 25771397 = 1159712865 / (1 + 1 + 5 + 9 + 7 + 1 + 2 + 8 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 1159712865.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12885654 + ... + 12885743.

It is an arithmetic number, because the mean of its divisors is an integer number (167514087).

Almost surely, 2^1159712865 is an apocalyptic number.

1159712865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1159712865 is a deficient number, since it is larger than the sum of its proper divisors (850456179).

1159712865 is a wasteful number, since it uses less digits than its factorization.

1159712865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25771408 (or 25771405 counting only the distinct ones).

The product of its digits is 151200, while the sum is 45.

The square root of 1159712865 is about 34054.5571840246. The cubic root of 1159712865 is about 1050.6308725769.

The spelling of 1159712865 in words is "one billion, one hundred fifty-nine million, seven hundred twelve thousand, eight hundred sixty-five".