198440549 has 2 divisors, whose sum is σ = 198440550. Its totient is φ = 198440548.

The previous prime is 198440537. The next prime is 198440581. The reversal of 198440549 is 945044891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107848225 + 90592324 = 10385^2 + 9518^2 .

It is a cyclic number.

It is not a de Polignac number, because 198440549 - 2⁸ = 198440293 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198440149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99220274 + 99220275.

It is an arithmetic number, because the mean of its divisors is an integer number (99220275).

Almost surely, 2^198440549 is an apocalyptic number.

It is an amenable number.

198440549 is a deficient number, since it is larger than the sum of its proper divisors (1).

198440549 is an equidigital number, since it uses as much as digits as its factorization.

198440549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 198440549 is about 14086.8928085650. The cubic root of 198440549 is about 583.2796258217.

The spelling of 198440549 in words is "one hundred ninety-eight million, four hundred forty thousand, five hundred forty-nine".