198979101 has 36 divisors (see below), whose sum is σ = 308472372. Its totient is φ = 123561984.

The previous prime is 198979091. The next prime is 198979129. The reversal of 198979101 is 101979891.

It can be written as a sum of positive squares in 6 ways, for example, as 20115225 + 178863876 = 4485^2 + 13374^2 .

It is not a de Polignac number, because 198979101 - 2⁵ = 198979069 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198979181) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 293575 + ... + 294251.

It is an arithmetic number, because the mean of its divisors is an integer number (8568677).

Almost surely, 2^198979101 is an apocalyptic number.

It is an amenable number.

198979101 is a deficient number, since it is larger than the sum of its proper divisors (109493271).

198979101 is a wasteful number, since it uses less digits than its factorization.

198979101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830 (or 810 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 45.

The square root of 198979101 is about 14105.9952148014. The cubic root of 198979101 is about 583.8068075005.

The spelling of 198979101 in words is "one hundred ninety-eight million, nine hundred seventy-nine thousand, one hundred one".