2168191049 has 4 divisors (see below), whose sum is σ = 2188082820. Its totient is φ = 2148299280.

The previous prime is 2168191043. The next prime is 2168191063. The reversal of 2168191049 is 9401918612.

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 1607448649 + 560742400 = 40093^2 + 23680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2168191049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2168190997 and 2168191015.

It is not an unprimeable number, because it can be changed into a prime (2168191043) 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, 9945722 + ... + 9945939.

It is an arithmetic number, because the mean of its divisors is an integer number (547020705).

Almost surely, 2^2168191049 is an apocalyptic number.

It is an amenable number.

2168191049 is a deficient number, since it is larger than the sum of its proper divisors (19891771).

2168191049 is a wasteful number, since it uses less digits than its factorization.

2168191049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19891770.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 2168191049 is about 46563.8384264012. The cubic root of 2168191049 is about 1294.2927418140.

The spelling of 2168191049 in words is "two billion, one hundred sixty-eight million, one hundred ninety-one thousand, forty-nine".