198904613 has 2 divisors, whose sum is σ = 198904614. Its totient is φ = 198904612.

The previous prime is 198904577. The next prime is 198904619. The reversal of 198904613 is 316409891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130462084 + 68442529 = 11422^2 + 8273^2 .

It is a cyclic number.

It is not a de Polignac number, because 198904613 - 2⁶ = 198904549 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198904619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99452306 + 99452307.

It is an arithmetic number, because the mean of its divisors is an integer number (99452307).

Almost surely, 2^198904613 is an apocalyptic number.

It is an amenable number.

198904613 is a deficient number, since it is larger than the sum of its proper divisors (1).

198904613 is an equidigital number, since it uses as much as digits as its factorization.

198904613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 198904613 is about 14103.3546718502. The cubic root of 198904613 is about 583.7339488790.

The spelling of 198904613 in words is "one hundred ninety-eight million, nine hundred four thousand, six hundred thirteen".