198444691 has 2 divisors, whose sum is σ = 198444692. Its totient is φ = 198444690.

The previous prime is 198444647. The next prime is 198444707. The reversal of 198444691 is 196444891.

It is a strong prime.

It is an emirp because it is prime and its reverse (196444891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198444691 - 2¹⁵ = 198411923 is a prime.

It is not a weakly prime, because it can be changed into another prime (198444091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99222345 + 99222346.

It is an arithmetic number, because the mean of its divisors is an integer number (99222346).

Almost surely, 2^198444691 is an apocalyptic number.

198444691 is a deficient number, since it is larger than the sum of its proper divisors (1).

198444691 is an equidigital number, since it uses as much as digits as its factorization.

198444691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 46.

The square root of 198444691 is about 14087.0398238949. The cubic root of 198444691 is about 583.2836840101.

It can be divided in two parts, 198 and 444691, that added together give a square (444889 = 667²).

The spelling of 198444691 in words is "one hundred ninety-eight million, four hundred forty-four thousand, six hundred ninety-one".