11191993 has 2 divisors, whose sum is σ = 11191994. Its totient is φ = 11191992.

The previous prime is 11191991. The next prime is 11192003. The reversal of 11191993 is 39919111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10323369 + 868624 = 3213^2 + 932^2 .

It is a cyclic number.

It is not a de Polignac number, because 11191993 - 2¹ = 11191991 is a prime.

Together with 11191991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11191991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5595996 + 5595997.

It is an arithmetic number, because the mean of its divisors is an integer number (5595997).

Almost surely, 2^11191993 is an apocalyptic number.

It is an amenable number.

11191993 is a deficient number, since it is larger than the sum of its proper divisors (1).

11191993 is an equidigital number, since it uses as much as digits as its factorization.

11191993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2187, while the sum is 34.

The square root of 11191993 is about 3345.4436178181. The cubic root of 11191993 is about 223.6844581914.

The spelling of 11191993 in words is "eleven million, one hundred ninety-one thousand, nine hundred ninety-three".