198294557 has 2 divisors, whose sum is σ = 198294558. Its totient is φ = 198294556.

The previous prime is 198294539. The next prime is 198294563. The reversal of 198294557 is 755492891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157602916 + 40691641 = 12554^2 + 6379^2 .

It is a cyclic number.

It is not a de Polignac number, because 198294557 - 2⁸ = 198294301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198294587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99147278 + 99147279.

It is an arithmetic number, because the mean of its divisors is an integer number (99147279).

Almost surely, 2^198294557 is an apocalyptic number.

It is an amenable number.

198294557 is a deficient number, since it is larger than the sum of its proper divisors (1).

198294557 is an equidigital number, since it uses as much as digits as its factorization.

198294557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907200, while the sum is 50.

The square root of 198294557 is about 14081.7100168978. The cubic root of 198294557 is about 583.1365518203.

The spelling of 198294557 in words is "one hundred ninety-eight million, two hundred ninety-four thousand, five hundred fifty-seven".