198136979 has 2 divisors, whose sum is σ = 198136980. Its totient is φ = 198136978.

The previous prime is 198136963. The next prime is 198136999. The reversal of 198136979 is 979631891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198136979 - 2⁴ = 198136963 is a prime.

It is a super-3 number, since 3×198136979³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 198136979.

It is not a weakly prime, because it can be changed into another prime (198136999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99068489 + 99068490.

It is an arithmetic number, because the mean of its divisors is an integer number (99068490).

Almost surely, 2^198136979 is an apocalyptic number.

198136979 is a deficient number, since it is larger than the sum of its proper divisors (1).

198136979 is an equidigital number, since it uses as much as digits as its factorization.

198136979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 53.

The square root of 198136979 is about 14076.1137747604. The cubic root of 198136979 is about 582.9820445657.

The spelling of 198136979 in words is "one hundred ninety-eight million, one hundred thirty-six thousand, nine hundred seventy-nine".