198622381 has 2 divisors, whose sum is σ = 198622382. Its totient is φ = 198622380.

The previous prime is 198622367. The next prime is 198622397. The reversal of 198622381 is 183226891.

198622381 = 9965² + 9966².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99321156 + 99301225 = 9966^2 + 9965^2 .

It is an emirp because it is prime and its reverse (183226891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198622381 - 2⁵ = 198622349 is a prime.

It is a super-2 number, since 2×198622381² = 78901700468218322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198622351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99311190 + 99311191.

It is an arithmetic number, because the mean of its divisors is an integer number (99311191).

Almost surely, 2^198622381 is an apocalyptic number.

198622381 is the 9966-th centered square number.

It is an amenable number.

198622381 is a deficient number, since it is larger than the sum of its proper divisors (1).

198622381 is an equidigital number, since it uses as much as digits as its factorization.

198622381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 40.

The square root of 198622381 is about 14093.3452735679. The cubic root of 198622381 is about 583.4577253816.

The spelling of 198622381 in words is "one hundred ninety-eight million, six hundred twenty-two thousand, three hundred eighty-one".