8091890869 has 4 divisors (see below), whose sum is σ = 8092093644. Its totient is φ = 8091688096.

The previous prime is 8091890857. The next prime is 8091890903. The reversal of 8091890869 is 9680981908.

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 5736244644 + 2355646225 = 75738^2 + 48535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8091890869 is a prime.

It is a super-2 number, since 2×8091890869² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8091890819) 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, 19462 + ... + 128695.

It is an arithmetic number, because the mean of its divisors is an integer number (2023023411).

Almost surely, 2^8091890869 is an apocalyptic number.

It is an amenable number.

8091890869 is a deficient number, since it is larger than the sum of its proper divisors (202775).

8091890869 is a wasteful number, since it uses less digits than its factorization.

8091890869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202774.

The product of its (nonzero) digits is 2239488, while the sum is 58.

The square root of 8091890869 is about 89954.9379911965. The cubic root of 8091890869 is about 2007.6284388832.

The spelling of 8091890869 in words is "eight billion, ninety-one million, eight hundred ninety thousand, eight hundred sixty-nine".