198155899 has 2 divisors, whose sum is σ = 198155900. Its totient is φ = 198155898.

The previous prime is 198155887. The next prime is 198155933. The reversal of 198155899 is 998551891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198155899 - 2¹³ = 198147707 is a prime.

It is not a weakly prime, because it can be changed into another prime (198155819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99077949 + 99077950.

It is an arithmetic number, because the mean of its divisors is an integer number (99077950).

Almost surely, 2^198155899 is an apocalyptic number.

198155899 is a deficient number, since it is larger than the sum of its proper divisors (1).

198155899 is an equidigital number, since it uses as much as digits as its factorization.

198155899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1166400, while the sum is 55.

The square root of 198155899 is about 14076.7858192131. The cubic root of 198155899 is about 583.0006001953. Note that the first 3 decimals are identical.

The spelling of 198155899 in words is "one hundred ninety-eight million, one hundred fifty-five thousand, eight hundred ninety-nine".