199950691 has 2 divisors, whose sum is σ = 199950692. Its totient is φ = 199950690.

The previous prime is 199950689. The next prime is 199950749. The reversal of 199950691 is 196059991.

199950691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199950691 - 2¹ = 199950689 is a prime.

Together with 199950689, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (199950601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99975345 + 99975346.

It is an arithmetic number, because the mean of its divisors is an integer number (99975346).

Almost surely, 2^199950691 is an apocalyptic number.

199950691 is a deficient number, since it is larger than the sum of its proper divisors (1).

199950691 is an equidigital number, since it uses as much as digits as its factorization.

199950691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 196830, while the sum is 49.

The square root of 199950691 is about 14140.3921798513. The cubic root of 199950691 is about 584.7554835622.

The spelling of 199950691 in words is "one hundred ninety-nine million, nine hundred fifty thousand, six hundred ninety-one".