198091669 has 4 divisors (see below), whose sum is σ = 202698496. Its totient is φ = 193484844.

The previous prime is 198091651. The next prime is 198091681. The reversal of 198091669 is 966190891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 198091669 - 2¹¹ = 198089621 is a prime.

It is a super-2 number, since 2×198091669² = 78480618654411122, which 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 (198091609) 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, 2303349 + ... + 2303434.

It is an arithmetic number, because the mean of its divisors is an integer number (50674624).

Almost surely, 2^198091669 is an apocalyptic number.

It is an amenable number.

198091669 is a deficient number, since it is larger than the sum of its proper divisors (4606827).

198091669 is an equidigital number, since it uses as much as digits as its factorization.

198091669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4606826.

The product of its (nonzero) digits is 209952, while the sum is 49.

The square root of 198091669 is about 14074.5042186217. The cubic root of 198091669 is about 582.9376023649.

The spelling of 198091669 in words is "one hundred ninety-eight million, ninety-one thousand, six hundred sixty-nine".