198962221 has 2 divisors, whose sum is σ = 198962222. Its totient is φ = 198962220.

The previous prime is 198962207. The next prime is 198962251. The reversal of 198962221 is 122269891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142922025 + 56040196 = 11955^2 + 7486^2 .

It is a cyclic number.

It is not a de Polignac number, because 198962221 - 2¹³ = 198954029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198962251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99481110 + 99481111.

It is an arithmetic number, because the mean of its divisors is an integer number (99481111).

Almost surely, 2^198962221 is an apocalyptic number.

It is an amenable number.

198962221 is a deficient number, since it is larger than the sum of its proper divisors (1).

198962221 is an equidigital number, since it uses as much as digits as its factorization.

198962221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 40.

The square root of 198962221 is about 14105.3968749553. The cubic root of 198962221 is about 583.7902983336.

The spelling of 198962221 in words is "one hundred ninety-eight million, nine hundred sixty-two thousand, two hundred twenty-one".