198579551 has 2 divisors, whose sum is σ = 198579552. Its totient is φ = 198579550.

The previous prime is 198579541. The next prime is 198579581. The reversal of 198579551 is 155975891.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198579551 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 198579551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198579541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99289775 + 99289776.

It is an arithmetic number, because the mean of its divisors is an integer number (99289776).

Almost surely, 2^198579551 is an apocalyptic number.

198579551 is a deficient number, since it is larger than the sum of its proper divisors (1).

198579551 is an equidigital number, since it uses as much as digits as its factorization.

198579551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 567000, while the sum is 50.

The square root of 198579551 is about 14091.8256801594. The cubic root of 198579551 is about 583.4157843364.

The spelling of 198579551 in words is "one hundred ninety-eight million, five hundred seventy-nine thousand, five hundred fifty-one".