198311959 has 4 divisors (see below), whose sum is σ = 198864720. Its totient is φ = 197759200.

The previous prime is 198311933. The next prime is 198311963. The reversal of 198311959 is 959113891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 959113891 = 1871 ⋅512621.

It is a cyclic number.

It is not a de Polignac number, because 198311959 - 2¹³ = 198303767 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 (198311909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275842 + ... + 276559.

It is an arithmetic number, because the mean of its divisors is an integer number (49716180).

Almost surely, 2^198311959 is an apocalyptic number.

198311959 is a deficient number, since it is larger than the sum of its proper divisors (552761).

198311959 is an equidigital number, since it uses as much as digits as its factorization.

198311959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552760.

The product of its digits is 87480, while the sum is 46.

The square root of 198311959 is about 14082.3278970488. The cubic root of 198311959 is about 583.1536096854.

The spelling of 198311959 in words is "one hundred ninety-eight million, three hundred eleven thousand, nine hundred fifty-nine".