2191393 has 2 divisors, whose sum is σ = 2191394. Its totient is φ = 2191392.

The previous prime is 2191373. The next prime is 2191429. The reversal of 2191393 is 3931912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2024929 + 166464 = 1423^2 + 408^2 .

It is a cyclic number.

It is not a de Polignac number, because 2191393 - 2¹³ = 2183201 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (2191363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095696 + 1095697.

It is an arithmetic number, because the mean of its divisors is an integer number (1095697).

2^2191393 is an apocalyptic number.

It is an amenable number.

2191393 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191393 is an equidigital number, since it uses as much as digits as its factorization.

2191393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1458, while the sum is 28.

The square root of 2191393 is about 1480.3354349606. The cubic root of 2191393 is about 129.8893140694.

The spelling of 2191393 in words is "two million, one hundred ninety-one thousand, three hundred ninety-three".