2091873169 has 3 divisors (see below), whose sum is σ = 2091918907. Its totient is φ = 2091827432.

The previous prime is 2091873151. The next prime is 2091873197. The reversal of 2091873169 is 9613781902.

It is a happy number.

The square root of 2091873169 is 45737.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 482900625 + 1608972544 = 21975^2 + 40112^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2091873169 is a prime.

It is a super-2 number, since 2×2091873169² = 8751866710364205122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2091873869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 22869 + ... + 68605.

Almost surely, 2^2091873169 is an apocalyptic number.

2091873169 is the 45737-th square number.

2091873169 is the 22869-th centered octagonal number.

It is an amenable number.

2091873169 is a deficient number, since it is larger than the sum of its proper divisors (45738).

2091873169 is an frugal number, since it uses more digits than its factorization.

2091873169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91474 (or 45737 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 46.

The cubic root of 2091873169 is about 1278.9251167003.

The spelling of 2091873169 in words is "two billion, ninety-one million, eight hundred seventy-three thousand, one hundred sixty-nine".