199018613 has 2 divisors, whose sum is σ = 199018614. Its totient is φ = 199018612.

The previous prime is 199018607. The next prime is 199018621. The reversal of 199018613 is 316810991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191739409 + 7279204 = 13847^2 + 2698^2 .

It is a cyclic number.

It is not a de Polignac number, because 199018613 - 2⁶ = 199018549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199018693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99509306 + 99509307.

It is an arithmetic number, because the mean of its divisors is an integer number (99509307).

Almost surely, 2^199018613 is an apocalyptic number.

It is an amenable number.

199018613 is a deficient number, since it is larger than the sum of its proper divisors (1).

199018613 is an equidigital number, since it uses as much as digits as its factorization.

199018613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 199018613 is about 14107.3956845337. The cubic root of 199018613 is about 583.8454478197.

The spelling of 199018613 in words is "one hundred ninety-nine million, eighteen thousand, six hundred thirteen".