198945511 has 2 divisors, whose sum is σ = 198945512. Its totient is φ = 198945510.

The previous prime is 198945503. The next prime is 198945521. The reversal of 198945511 is 115549891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198945511 - 2³ = 198945503 is a prime.

It is a super-2 number, since 2×198945511² = 79158632694102242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198945521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99472755 + 99472756.

It is an arithmetic number, because the mean of its divisors is an integer number (99472756).

Almost surely, 2^198945511 is an apocalyptic number.

198945511 is a deficient number, since it is larger than the sum of its proper divisors (1).

198945511 is an equidigital number, since it uses as much as digits as its factorization.

198945511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 43.

The square root of 198945511 is about 14104.8045360437. The cubic root of 198945511 is about 583.7739545122.

The spelling of 198945511 in words is "one hundred ninety-eight million, nine hundred forty-five thousand, five hundred eleven".