198857941 has 2 divisors, whose sum is σ = 198857942. Its totient is φ = 198857940.

The previous prime is 198857917. The next prime is 198857947. The reversal of 198857941 is 149758891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197993041 + 864900 = 14071^2 + 930^2 .

It is an emirp because it is prime and its reverse (149758891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198857941 - 2⁵ = 198857909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198857947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99428970 + 99428971.

It is an arithmetic number, because the mean of its divisors is an integer number (99428971).

Almost surely, 2^198857941 is an apocalyptic number.

It is an amenable number.

198857941 is a deficient number, since it is larger than the sum of its proper divisors (1).

198857941 is an equidigital number, since it uses as much as digits as its factorization.

198857941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 52.

The square root of 198857941 is about 14101.6999329868. The cubic root of 198857941 is about 583.6882885302.

The spelling of 198857941 in words is "one hundred ninety-eight million, eight hundred fifty-seven thousand, nine hundred forty-one".