199908131 has 2 divisors, whose sum is σ = 199908132. Its totient is φ = 199908130.

The previous prime is 199908113. The next prime is 199908167. The reversal of 199908131 is 131809991.

It is a happy number.

Together with previous prime (199908113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (131809991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199908131 - 2⁶ = 199908067 is a prime.

It is a super-2 number, since 2×199908131² = 79926521679826322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199908031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99954065 + 99954066.

It is an arithmetic number, because the mean of its divisors is an integer number (99954066).

Almost surely, 2^199908131 is an apocalyptic number.

199908131 is a deficient number, since it is larger than the sum of its proper divisors (1).

199908131 is an equidigital number, since it uses as much as digits as its factorization.

199908131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 41.

The square root of 199908131 is about 14138.8871910062. The cubic root of 199908131 is about 584.7139917336.

The spelling of 199908131 in words is "one hundred ninety-nine million, nine hundred eight thousand, one hundred thirty-one".