195598813 has 2 divisors, whose sum is σ = 195598814. Its totient is φ = 195598812.

The previous prime is 195598811. The next prime is 195598829. The reversal of 195598813 is 318895591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192293689 + 3305124 = 13867^2 + 1818^2 .

It is a cyclic number.

It is not a de Polignac number, because 195598813 - 2¹ = 195598811 is a prime.

Together with 195598811, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195598811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97799406 + 97799407.

It is an arithmetic number, because the mean of its divisors is an integer number (97799407).

Almost surely, 2^195598813 is an apocalyptic number.

It is an amenable number.

195598813 is a deficient number, since it is larger than the sum of its proper divisors (1).

195598813 is an equidigital number, since it uses as much as digits as its factorization.

195598813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 388800, while the sum is 49.

The square root of 195598813 is about 13985.6645533918. The cubic root of 195598813 is about 580.4819745214.

The spelling of 195598813 in words is "one hundred ninety-five million, five hundred ninety-eight thousand, eight hundred thirteen".