1121599159 has 4 divisors (see below), whose sum is σ = 1129027120. Its totient is φ = 1114171200.

The previous prime is 1121599133. The next prime is 1121599183. The reversal of 1121599159 is 9519951211.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9519951211 = 34687 ⋅274453.

It is a cyclic number.

It is not a de Polignac number, because 1121599159 - 2¹¹ = 1121597111 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 (1121599459) 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, 3713754 + ... + 3714055.

It is an arithmetic number, because the mean of its divisors is an integer number (282256780).

Almost surely, 2^1121599159 is an apocalyptic number.

1121599159 is a deficient number, since it is larger than the sum of its proper divisors (7427961).

1121599159 is an equidigital number, since it uses as much as digits as its factorization.

1121599159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7427960.

The product of its digits is 36450, while the sum is 43.

The square root of 1121599159 is about 33490.2845464173. The cubic root of 1121599159 is about 1038.9928486309.

The spelling of 1121599159 in words is "one billion, one hundred twenty-one million, five hundred ninety-nine thousand, one hundred fifty-nine".