198145799 has 2 divisors, whose sum is σ = 198145800. Its totient is φ = 198145798.

The previous prime is 198145789. The next prime is 198145807. The reversal of 198145799 is 997541891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 198145799 - 2⁸ = 198145543 is a prime.

It is a super-3 number, since 3×198145799³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 198145799.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198145709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99072899 + 99072900.

It is an arithmetic number, because the mean of its divisors is an integer number (99072900).

Almost surely, 2^198145799 is an apocalyptic number.

198145799 is a deficient number, since it is larger than the sum of its proper divisors (1).

198145799 is an equidigital number, since it uses as much as digits as its factorization.

198145799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 53.

The square root of 198145799 is about 14076.4270679743. The cubic root of 198145799 is about 582.9906948529.

The spelling of 198145799 in words is "one hundred ninety-eight million, one hundred forty-five thousand, seven hundred ninety-nine".