198085621 has 4 divisors (see below), whose sum is σ = 208511200. Its totient is φ = 187660044.

The previous prime is 198085561. The next prime is 198085633. The reversal of 198085621 is 126580891.

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, and also an emirpimes, since its reverse is a distinct semiprime: 126580891 = 23 ⋅5503517.

It is a cyclic number.

It is not a de Polignac number, because 198085621 - 2¹⁵ = 198052853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198085651) 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, 5212761 + ... + 5212798.

It is an arithmetic number, because the mean of its divisors is an integer number (52127800).

Almost surely, 2^198085621 is an apocalyptic number.

It is an amenable number.

198085621 is a deficient number, since it is larger than the sum of its proper divisors (10425579).

198085621 is a wasteful number, since it uses less digits than its factorization.

198085621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10425578.

The product of its (nonzero) digits is 34560, while the sum is 40.

The square root of 198085621 is about 14074.2893603905. The cubic root of 198085621 is about 582.9316696865.

The spelling of 198085621 in words is "one hundred ninety-eight million, eighty-five thousand, six hundred twenty-one".