1159785561 has 8 divisors (see below), whose sum is σ = 1686960864. Its totient is φ = 702900320.

The previous prime is 1159785541. The next prime is 1159785617. The reversal of 1159785561 is 1655879511.

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

It is a cyclic number.

It is not a de Polignac number, because 1159785561 - 2⁹ = 1159785049 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1159785561.

It is not an unprimeable number, because it can be changed into a prime (1159785541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17572476 + ... + 17572541.

It is an arithmetic number, because the mean of its divisors is an integer number (210870108).

Almost surely, 2^1159785561 is an apocalyptic number.

1159785561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1159785561 is a deficient number, since it is larger than the sum of its proper divisors (527175303).

1159785561 is a wasteful number, since it uses less digits than its factorization.

1159785561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35145031.

The product of its digits is 378000, while the sum is 48.

The square root of 1159785561 is about 34055.6245134339. The cubic root of 1159785561 is about 1050.6528248689.

The spelling of 1159785561 in words is "one billion, one hundred fifty-nine million, seven hundred eighty-five thousand, five hundred sixty-one".