191163893 has 2 divisors, whose sum is σ = 191163894. Its totient is φ = 191163892.

The previous prime is 191163839. The next prime is 191163937. The reversal of 191163893 is 398361191.

Together with previous prime (191163839) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168143089 + 23020804 = 12967^2 + 4798^2 .

It is a cyclic number.

It is not a de Polignac number, because 191163893 - 2¹⁸ = 190901749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191163893.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191163293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95581946 + 95581947.

It is an arithmetic number, because the mean of its divisors is an integer number (95581947).

Almost surely, 2^191163893 is an apocalyptic number.

It is an amenable number.

191163893 is a deficient number, since it is larger than the sum of its proper divisors (1).

191163893 is an equidigital number, since it uses as much as digits as its factorization.

191163893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 41.

The square root of 191163893 is about 13826.2031302885. The cubic root of 191163893 is about 576.0611964382.

The spelling of 191163893 in words is "one hundred ninety-one million, one hundred sixty-three thousand, eight hundred ninety-three".