2159793649 has 4 divisors (see below), whose sum is σ = 2325931636. Its totient is φ = 1993655664.

The previous prime is 2159793617. The next prime is 2159793673. The reversal of 2159793649 is 9463979512.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 230827249 + 1928966400 = 15193^2 + 43920^2 .

It is not a de Polignac number, because 2159793649 - 2⁵ = 2159793617 is a prime.

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 2159793649.

It is not an unprimeable number, because it can be changed into a prime (2159790649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83068974 + ... + 83068999.

It is an arithmetic number, because the mean of its divisors is an integer number (581482909).

Almost surely, 2^2159793649 is an apocalyptic number.

It is an amenable number.

2159793649 is a deficient number, since it is larger than the sum of its proper divisors (166137987).

2159793649 is a wasteful number, since it uses less digits than its factorization.

2159793649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166137986.

The product of its digits is 3674160, while the sum is 55.

The square root of 2159793649 is about 46473.5801181704. The cubic root of 2159793649 is about 1292.6196488422.

The spelling of 2159793649 in words is "two billion, one hundred fifty-nine million, seven hundred ninety-three thousand, six hundred forty-nine".