198364657 has 2 divisors, whose sum is σ = 198364658. Its totient is φ = 198364656.

The previous prime is 198364613. The next prime is 198364681. The reversal of 198364657 is 756463891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122744241 + 75620416 = 11079^2 + 8696^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198364657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 198364657.

It is not a weakly prime, because it can be changed into another prime (198364057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99182328 + 99182329.

It is an arithmetic number, because the mean of its divisors is an integer number (99182329).

Almost surely, 2^198364657 is an apocalyptic number.

It is an amenable number.

198364657 is a deficient number, since it is larger than the sum of its proper divisors (1).

198364657 is an equidigital number, since it uses as much as digits as its factorization.

198364657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 49.

The square root of 198364657 is about 14084.1988412547. The cubic root of 198364657 is about 583.2052594655.

The spelling of 198364657 in words is "one hundred ninety-eight million, three hundred sixty-four thousand, six hundred fifty-seven".