11531993 has 16 divisors (see below), whose sum is σ = 13824000. Its totient is φ = 9496080.

The previous prime is 11531987. The next prime is 11532011. The reversal of 11531993 is 39913511.

It is a happy number.

It is not a de Polignac number, because 11531993 - 2⁴ = 11531977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11531903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3608 + ... + 6006.

It is an arithmetic number, because the mean of its divisors is an integer number (864000).

Almost surely, 2^11531993 is an apocalyptic number.

It is an amenable number.

11531993 is a deficient number, since it is larger than the sum of its proper divisors (2292007).

11531993 is a wasteful number, since it uses less digits than its factorization.

11531993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2452.

The product of its digits is 3645, while the sum is 32.

The square root of 11531993 is about 3395.8788258711. The cubic root of 11531993 is about 225.9269936741.

The spelling of 11531993 in words is "eleven million, five hundred thirty-one thousand, nine hundred ninety-three".