196505191 has 2 divisors, whose sum is σ = 196505192. Its totient is φ = 196505190.

The previous prime is 196505161. The next prime is 196505203. The reversal of 196505191 is 191505691.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 196505191 - 2¹⁹ = 195980903 is a prime.

It is a super-2 number, since 2×196505191² = 77228580179892962, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 196505191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196505161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98252595 + 98252596.

It is an arithmetic number, because the mean of its divisors is an integer number (98252596).

Almost surely, 2^196505191 is an apocalyptic number.

196505191 is a deficient number, since it is larger than the sum of its proper divisors (1).

196505191 is an equidigital number, since it uses as much as digits as its factorization.

196505191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12150, while the sum is 37.

The square root of 196505191 is about 14018.0309244915. The cubic root of 196505191 is about 581.3772176775.

The spelling of 196505191 in words is "one hundred ninety-six million, five hundred five thousand, one hundred ninety-one".