891082193 has 2 divisors, whose sum is σ = 891082194. Its totient is φ = 891082192.

The previous prime is 891082117. The next prime is 891082207. The reversal of 891082193 is 391280198.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 652904704 + 238177489 = 25552^2 + 15433^2 .

It is a cyclic number.

It is not a de Polignac number, because 891082193 - 2⁸ = 891081937 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 891082193.

It is not a weakly prime, because it can be changed into another prime (891082793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445541096 + 445541097.

It is an arithmetic number, because the mean of its divisors is an integer number (445541097).

Almost surely, 2^891082193 is an apocalyptic number.

It is an amenable number.

891082193 is a deficient number, since it is larger than the sum of its proper divisors (1).

891082193 is an equidigital number, since it uses as much as digits as its factorization.

891082193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 891082193 is about 29850.9998660011. Note that the first 3 decimals coincide. The cubic root of 891082193 is about 962.2898869632.

The spelling of 891082193 in words is "eight hundred ninety-one million, eighty-two thousand, one hundred ninety-three".