198807449389 has 2 divisors, whose sum is σ = 198807449390. Its totient is φ = 198807449388.

The previous prime is 198807449383. The next prime is 198807449413. The reversal of 198807449389 is 983944708891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193541044489 + 5266404900 = 439933^2 + 72570^2 .

It is a cyclic number.

It is not a de Polignac number, because 198807449389 - 2⁹ = 198807448877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198807449383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99403724694 + 99403724695.

It is an arithmetic number, because the mean of its divisors is an integer number (99403724695).

Almost surely, 2^198807449389 is an apocalyptic number.

It is an amenable number.

198807449389 is a deficient number, since it is larger than the sum of its proper divisors (1).

198807449389 is an equidigital number, since it uses as much as digits as its factorization.

198807449389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 125411328, while the sum is 70.

The spelling of 198807449389 in words is "one hundred ninety-eight billion, eight hundred seven million, four hundred forty-nine thousand, three hundred eighty-nine".