198777281 has 16 divisors (see below), whose sum is σ = 209563200. Its totient is φ = 188290368.

The previous prime is 198777269. The next prime is 198777287. The reversal of 198777281 is 182777891.

It is a happy number.

198777281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 198777281 - 2¹⁴ = 198760897 is a prime.

It is a super-2 number, since 2×198777281² = 79024814883505922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198777287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 647330 + ... + 647636.

It is an arithmetic number, because the mean of its divisors is an integer number (13097700).

Almost surely, 2^198777281 is an apocalyptic number.

It is an amenable number.

198777281 is a deficient number, since it is larger than the sum of its proper divisors (10785919).

198777281 is a wasteful number, since it uses less digits than its factorization.

198777281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688.

The product of its digits is 395136, while the sum is 50.

The square root of 198777281 is about 14098.8397040324. The cubic root of 198777281 is about 583.6093600515.

The spelling of 198777281 in words is "one hundred ninety-eight million, seven hundred seventy-seven thousand, two hundred eighty-one".