190805911 has 2 divisors, whose sum is σ = 190805912. Its totient is φ = 190805910.

The previous prime is 190805893. The next prime is 190805959. The reversal of 190805911 is 119508091.

It is a weak prime.

It is an emirp because it is prime and its reverse (119508091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 190805911 - 2¹¹ = 190803863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190805971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95402955 + 95402956.

It is an arithmetic number, because the mean of its divisors is an integer number (95402956).

Almost surely, 2^190805911 is an apocalyptic number.

190805911 is a deficient number, since it is larger than the sum of its proper divisors (1).

190805911 is an equidigital number, since it uses as much as digits as its factorization.

190805911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 34.

The square root of 190805911 is about 13813.2512827357. The cubic root of 190805911 is about 575.7013858146.

The spelling of 190805911 in words is "one hundred ninety million, eight hundred five thousand, nine hundred eleven".