199880491 has 2 divisors, whose sum is σ = 199880492. Its totient is φ = 199880490.

The previous prime is 199880489. The next prime is 199880501. The reversal of 199880491 is 194088991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199880491 - 2¹ = 199880489 is a prime.

Together with 199880489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (199880411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99940245 + 99940246.

It is an arithmetic number, because the mean of its divisors is an integer number (99940246).

Almost surely, 2^199880491 is an apocalyptic number.

199880491 is a deficient number, since it is larger than the sum of its proper divisors (1).

199880491 is an equidigital number, since it uses as much as digits as its factorization.

199880491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 49.

The square root of 199880491 is about 14137.9097111277. The cubic root of 199880491 is about 584.6870422885.

The spelling of 199880491 in words is "one hundred ninety-nine million, eight hundred eighty thousand, four hundred ninety-one".