2105198369 has 4 divisors (see below), whose sum is σ = 2110610580. Its totient is φ = 2099786160.

The previous prime is 2105198353. The next prime is 2105198393. The reversal of 2105198369 is 9638915012.

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 1143454225 + 961744144 = 33815^2 + 31012^2 .

It is a cyclic number.

It is not a de Polignac number, because 2105198369 - 2⁴ = 2105198353 is a prime.

It is a super-2 number, since 2×2105198369² = 8863720345680520322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2105198569) 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, 2705522 + ... + 2706299.

It is an arithmetic number, because the mean of its divisors is an integer number (527652645).

Almost surely, 2^2105198369 is an apocalyptic number.

It is an amenable number.

2105198369 is a deficient number, since it is larger than the sum of its proper divisors (5412211).

2105198369 is an equidigital number, since it uses as much as digits as its factorization.

2105198369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5412210.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 2105198369 is about 45882.4407480683. The cubic root of 2105198369 is about 1281.6349487486.

The spelling of 2105198369 in words is "two billion, one hundred five million, one hundred ninety-eight thousand, three hundred sixty-nine".