131809199 has 2 divisors, whose sum is σ = 131809200. Its totient is φ = 131809198.

The previous prime is 131809169. The next prime is 131809201. The reversal of 131809199 is 991908131.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 131809199 - 2¹² = 131805103 is a prime.

Together with 131809201, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131809169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65904599 + 65904600.

It is an arithmetic number, because the mean of its divisors is an integer number (65904600).

Almost surely, 2^131809199 is an apocalyptic number.

131809199 is a deficient number, since it is larger than the sum of its proper divisors (1).

131809199 is an equidigital number, since it uses as much as digits as its factorization.

131809199 is an odious number, because the sum of its binary digits is odd.

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

The square root of 131809199 is about 11480.8187425810. The cubic root of 131809199 is about 508.9188927470.

The spelling of 131809199 in words is "one hundred thirty-one million, eight hundred nine thousand, one hundred ninety-nine".