198765013 has 2 divisors, whose sum is σ = 198765014. Its totient is φ = 198765012.

The previous prime is 198764989. The next prime is 198765107. The reversal of 198765013 is 310567891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178676689 + 20088324 = 13367^2 + 4482^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198765013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198765113) 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, 99382506 + 99382507.

It is an arithmetic number, because the mean of its divisors is an integer number (99382507).

Almost surely, 2^198765013 is an apocalyptic number.

It is an amenable number.

198765013 is a deficient number, since it is larger than the sum of its proper divisors (1).

198765013 is an equidigital number, since it uses as much as digits as its factorization.

198765013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 198765013 is about 14098.4046260561. The cubic root of 198765013 is about 583.5973535370.

The spelling of 198765013 in words is "one hundred ninety-eight million, seven hundred sixty-five thousand, thirteen".