198897577 has 2 divisors, whose sum is σ = 198897578. Its totient is φ = 198897576.

The previous prime is 198897551. The next prime is 198897593. The reversal of 198897577 is 775798891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196112016 + 2785561 = 14004^2 + 1669^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198897577 is a prime.

It is a super-2 number, since 2×198897577² = 79120492272941858, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (198897527) 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, 99448788 + 99448789.

It is an arithmetic number, because the mean of its divisors is an integer number (99448789).

Almost surely, 2^198897577 is an apocalyptic number.

It is an amenable number.

198897577 is a deficient number, since it is larger than the sum of its proper divisors (1).

198897577 is an equidigital number, since it uses as much as digits as its factorization.

198897577 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8890560, while the sum is 61.

The square root of 198897577 is about 14103.1052254459. The cubic root of 198897577 is about 583.7270658470.

The spelling of 198897577 in words is "one hundred ninety-eight million, eight hundred ninety-seven thousand, five hundred seventy-seven".