2091121159 has 4 divisors (see below), whose sum is σ = 2214128304. Its totient is φ = 1968114016.

The previous prime is 2091121157. The next prime is 2091121163. The reversal of 2091121159 is 9511211902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2091121159 - 2¹ = 2091121157 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2091121159.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2091121157) 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, 61503547 + ... + 61503580.

It is an arithmetic number, because the mean of its divisors is an integer number (553532076).

Almost surely, 2^2091121159 is an apocalyptic number.

2091121159 is a deficient number, since it is larger than the sum of its proper divisors (123007145).

2091121159 is a wasteful number, since it uses less digits than its factorization.

2091121159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123007144.

The product of its (nonzero) digits is 1620, while the sum is 31.

The square root of 2091121159 is about 45728.7782364672. The cubic root of 2091121159 is about 1278.7718442230.

The spelling of 2091121159 in words is "two billion, ninety-one million, one hundred twenty-one thousand, one hundred fifty-nine".