199862813 has 2 divisors, whose sum is σ = 199862814. Its totient is φ = 199862812.

The previous prime is 199862783. The next prime is 199862827. The reversal of 199862813 is 318268991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172843609 + 27019204 = 13147^2 + 5198^2 .

It is a cyclic number.

It is not a de Polignac number, because 199862813 - 2⁶ = 199862749 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199832813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99931406 + 99931407.

It is an arithmetic number, because the mean of its divisors is an integer number (99931407).

Almost surely, 2^199862813 is an apocalyptic number.

It is an amenable number.

199862813 is a deficient number, since it is larger than the sum of its proper divisors (1).

199862813 is an equidigital number, since it uses as much as digits as its factorization.

199862813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 47.

The square root of 199862813 is about 14137.2844987996. The cubic root of 199862813 is about 584.6698046511.

The spelling of 199862813 in words is "one hundred ninety-nine million, eight hundred sixty-two thousand, eight hundred thirteen".