198540613 has 2 divisors, whose sum is σ = 198540614. Its totient is φ = 198540612.

The previous prime is 198540611. The next prime is 198540619. The reversal of 198540613 is 316045891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150626529 + 47914084 = 12273^2 + 6922^2 .

It is a cyclic number.

It is not a de Polignac number, because 198540613 - 2¹ = 198540611 is a prime.

Together with 198540611, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198540611) 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, 99270306 + 99270307.

It is an arithmetic number, because the mean of its divisors is an integer number (99270307).

Almost surely, 2^198540613 is an apocalyptic number.

It is an amenable number.

198540613 is a deficient number, since it is larger than the sum of its proper divisors (1).

198540613 is an equidigital number, since it uses as much as digits as its factorization.

198540613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 198540613 is about 14090.4440313285. Note that the first 3 decimals coincide. The cubic root of 198540613 is about 583.3776492772.

The spelling of 198540613 in words is "one hundred ninety-eight million, five hundred forty thousand, six hundred thirteen".