11281993 has 4 divisors (see below), whose sum is σ = 11339460. Its totient is φ = 11224528.

The previous prime is 11281987. The next prime is 11281997. The reversal of 11281993 is 39918211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39918211 = 163 ⋅244897.

It can be written as a sum of positive squares in 2 ways, for example, as 10936249 + 345744 = 3307^2 + 588^2 .

It is a cyclic number.

It is not a de Polignac number, because 11281993 - 2⁵ = 11281961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11281997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28438 + ... + 28831.

It is an arithmetic number, because the mean of its divisors is an integer number (2834865).

Almost surely, 2^11281993 is an apocalyptic number.

It is an amenable number.

11281993 is a deficient number, since it is larger than the sum of its proper divisors (57467).

11281993 is an equidigital number, since it uses as much as digits as its factorization.

11281993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57466.

The product of its digits is 3888, while the sum is 34.

The square root of 11281993 is about 3358.8678152020. The cubic root of 11281993 is about 224.2824416045.

The spelling of 11281993 in words is "eleven million, two hundred eighty-one thousand, nine hundred ninety-three".