1171555559 has 4 divisors (see below), whose sum is σ = 1171674504. Its totient is φ = 1171436616.

The previous prime is 1171555549. The next prime is 1171555571. The reversal of 1171555559 is 9555551711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9555551711 = 347 ⋅27537613.

It is a cyclic number.

It is not a de Polignac number, because 1171555559 - 2⁸ = 1171555303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1171555529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43217 + ... + 64890.

It is an arithmetic number, because the mean of its divisors is an integer number (292918626).

Almost surely, 2^1171555559 is an apocalyptic number.

1171555559 is a deficient number, since it is larger than the sum of its proper divisors (118945).

1171555559 is a wasteful number, since it uses less digits than its factorization.

1171555559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118944.

The product of its digits is 196875, while the sum is 44.

The square root of 1171555559 is about 34227.9937916320. The cubic root of 1171555559 is about 1054.1950266641.

The spelling of 1171555559 in words is "one billion, one hundred seventy-one million, five hundred fifty-five thousand, five hundred fifty-nine".