11691993 has 4 divisors (see below), whose sum is σ = 15589328. Its totient is φ = 7794660.

The previous prime is 11691989. The next prime is 11692003. The reversal of 11691993 is 39919611.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39919611 = 3 ⋅13306537.

It is not a de Polignac number, because 11691993 - 2² = 11691989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11691923) 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, 1948663 + ... + 1948668.

It is an arithmetic number, because the mean of its divisors is an integer number (3897332).

Almost surely, 2^11691993 is an apocalyptic number.

It is an amenable number.

11691993 is a deficient number, since it is larger than the sum of its proper divisors (3897335).

11691993 is an equidigital number, since it uses as much as digits as its factorization.

11691993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3897334.

The product of its digits is 13122, while the sum is 39.

The square root of 11691993 is about 3419.3556410529. The cubic root of 11691993 is about 226.9670687801.

The spelling of 11691993 in words is "eleven million, six hundred ninety-one thousand, nine hundred ninety-three".