199919903 has 2 divisors, whose sum is σ = 199919904. Its totient is φ = 199919902.

The previous prime is 199919897. The next prime is 199919921. The reversal of 199919903 is 309919991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199919903 - 2⁸ = 199919647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199919803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99959951 + 99959952.

It is an arithmetic number, because the mean of its divisors is an integer number (99959952).

Almost surely, 2^199919903 is an apocalyptic number.

199919903 is a deficient number, since it is larger than the sum of its proper divisors (1).

199919903 is an equidigital number, since it uses as much as digits as its factorization.

199919903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 177147, while the sum is 50.

The square root of 199919903 is about 14139.3034835525. The cubic root of 199919903 is about 584.7254688689.

The spelling of 199919903 in words is "one hundred ninety-nine million, nine hundred nineteen thousand, nine hundred three".