198979311 has 8 divisors (see below), whose sum is σ = 266285824. Its totient is φ = 132162840.

The previous prime is 198979309. The next prime is 198979337. The reversal of 198979311 is 113979891.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 198979311 - 2¹ = 198979309 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 (198979351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121561 + ... + 123186.

It is an arithmetic number, because the mean of its divisors is an integer number (33285728).

Almost surely, 2^198979311 is an apocalyptic number.

198979311 is a deficient number, since it is larger than the sum of its proper divisors (67306513).

198979311 is a wasteful number, since it uses less digits than its factorization.

198979311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245021.

The product of its digits is 122472, while the sum is 48.

The square root of 198979311 is about 14106.0026584430. The cubic root of 198979311 is about 583.8070128812.

The spelling of 198979311 in words is "one hundred ninety-eight million, nine hundred seventy-nine thousand, three hundred eleven".