198961613 has 2 divisors, whose sum is σ = 198961614. Its totient is φ = 198961612.

The previous prime is 198961603. The next prime is 198961619. The reversal of 198961613 is 316169891.

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., 188183524 + 10778089 = 13718^2 + 3283^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198961613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198961619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99480806 + 99480807.

It is an arithmetic number, because the mean of its divisors is an integer number (99480807).

Almost surely, 2^198961613 is an apocalyptic number.

It is an amenable number.

198961613 is a deficient number, since it is larger than the sum of its proper divisors (1).

198961613 is an equidigital number, since it uses as much as digits as its factorization.

198961613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 44.

The square root of 198961613 is about 14105.3753229044. The cubic root of 198961613 is about 583.7897036732.

The spelling of 198961613 in words is "one hundred ninety-eight million, nine hundred sixty-one thousand, six hundred thirteen".