11311993 has 24 divisors (see below), whose sum is σ = 14840064. Its totient is φ = 8517600.

The previous prime is 11311961. The next prime is 11311997. The reversal of 11311993 is 39911311.

It is not a de Polignac number, because 11311993 - 2⁵ = 11311961 is a prime.

It is a super-2 number, since 2×11311993² = 255922371264098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11311997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16371 + ... + 17047.

It is an arithmetic number, because the mean of its divisors is an integer number (618336).

Almost surely, 2^11311993 is an apocalyptic number.

It is an amenable number.

11311993 is a deficient number, since it is larger than the sum of its proper divisors (3528071).

11311993 is a wasteful number, since it uses less digits than its factorization.

11311993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733 (or 726 counting only the distinct ones).

The product of its digits is 729, while the sum is 28.

The square root of 11311993 is about 3363.3306408975. The cubic root of 11311993 is about 224.4810624846.

The spelling of 11311993 in words is "eleven million, three hundred eleven thousand, nine hundred ninety-three".