198897553 has 4 divisors (see below), whose sum is σ = 198925888. Its totient is φ = 198869220.

The previous prime is 198897551. The next prime is 198897577. The reversal of 198897553 is 355798891.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 198897553 - 2¹ = 198897551 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198897494 and 198897503.

It is not an unprimeable number, because it can be changed into a prime (198897551) 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, 5068 + ... + 20578.

It is an arithmetic number, because the mean of its divisors is an integer number (49731472).

Almost surely, 2^198897553 is an apocalyptic number.

It is an amenable number.

198897553 is a deficient number, since it is larger than the sum of its proper divisors (28335).

198897553 is a wasteful number, since it uses less digits than its factorization.

198897553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28334.

The product of its digits is 2721600, while the sum is 55.

The square root of 198897553 is about 14103.1043745695. The cubic root of 198897553 is about 583.7270423685.

The spelling of 198897553 in words is "one hundred ninety-eight million, eight hundred ninety-seven thousand, five hundred fifty-three".