198272909 has 2 divisors, whose sum is σ = 198272910. Its totient is φ = 198272908.

The previous prime is 198272821. The next prime is 198272917. The reversal of 198272909 is 909272891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120780100 + 77492809 = 10990^2 + 8803^2 .

It is a cyclic number.

It is not a de Polignac number, because 198272909 - 2⁸ = 198272653 is a prime.

It is a Chen prime.

It is equal to p_10988489 and since 198272909 and 10988489 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198272929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99136454 + 99136455.

It is an arithmetic number, because the mean of its divisors is an integer number (99136455).

Almost surely, 2^198272909 is an apocalyptic number.

It is an amenable number.

198272909 is a deficient number, since it is larger than the sum of its proper divisors (1).

198272909 is an equidigital number, since it uses as much as digits as its factorization.

198272909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 198272909 is about 14080.9413392713. The cubic root of 198272909 is about 583.1153305293.

The spelling of 198272909 in words is "one hundred ninety-eight million, two hundred seventy-two thousand, nine hundred nine".