198613 has 2 divisors, whose sum is σ = 198614. Its totient is φ = 198612.

The previous prime is 198599. The next prime is 198623. The reversal of 198613 is 316891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195364 + 3249 = 442^2 + 57^2 .

It is an emirp because it is prime and its reverse (316891) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198613 is a prime.

198613 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99306 + 99307.

It is an arithmetic number, because the mean of its divisors is an integer number (99307).

2¹⁹⁸⁶¹³ is an apocalyptic number.

It is an amenable number.

198613 is a deficient number, since it is larger than the sum of its proper divisors (1).

198613 is an equidigital number, since it uses as much as digits as its factorization.

198613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 28.

The square root of 198613 is about 445.6601844455. The cubic root of 198613 is about 58.3448539604.

The spelling of 198613 in words is "one hundred ninety-eight thousand, six hundred thirteen".