198945853 has 2 divisors, whose sum is σ = 198945854. Its totient is φ = 198945852.

The previous prime is 198945823. The next prime is 198945869. The reversal of 198945853 is 358549891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190495204 + 8450649 = 13802^2 + 2907^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198945853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 198945853.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198945823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99472926 + 99472927.

It is an arithmetic number, because the mean of its divisors is an integer number (99472927).

Almost surely, 2^198945853 is an apocalyptic number.

It is an amenable number.

198945853 is a deficient number, since it is larger than the sum of its proper divisors (1).

198945853 is an equidigital number, since it uses as much as digits as its factorization.

198945853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555200, while the sum is 52.

The square root of 198945853 is about 14104.8166595670. The cubic root of 198945853 is about 583.7742890269.

The spelling of 198945853 in words is "one hundred ninety-eight million, nine hundred forty-five thousand, eight hundred fifty-three".