198613589 has 2 divisors, whose sum is σ = 198613590. Its totient is φ = 198613588.

The previous prime is 198613577. The next prime is 198613607. The reversal of 198613589 is 985316891.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111471364 + 87142225 = 10558^2 + 9335^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198613589 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198613549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99306794 + 99306795.

It is an arithmetic number, because the mean of its divisors is an integer number (99306795).

Almost surely, 2^198613589 is an apocalyptic number.

It is an amenable number.

198613589 is a deficient number, since it is larger than the sum of its proper divisors (1).

198613589 is an equidigital number, since it uses as much as digits as its factorization.

198613589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 50.

The square root of 198613589 is about 14093.0333498506. The cubic root of 198613589 is about 583.4491163551.

The spelling of 198613589 in words is "one hundred ninety-eight million, six hundred thirteen thousand, five hundred eighty-nine".