11687321 has 4 divisors (see below), whose sum is σ = 11702544. Its totient is φ = 11672100.

The previous prime is 11687309. The next prime is 11687327. The reversal of 11687321 is 12378611.

11687321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 12378611 = 7 ⋅1768373.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11687321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11687327) 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, 6395 + ... + 8016.

It is an arithmetic number, because the mean of its divisors is an integer number (2925636).

Almost surely, 2^11687321 is an apocalyptic number.

It is an amenable number.

11687321 is a deficient number, since it is larger than the sum of its proper divisors (15223).

11687321 is an equidigital number, since it uses as much as digits as its factorization.

11687321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15222.

The product of its digits is 2016, while the sum is 29.

The square root of 11687321 is about 3418.6724031413. The cubic root of 11687321 is about 226.9368335181.

The spelling of 11687321 in words is "eleven million, six hundred eighty-seven thousand, three hundred twenty-one".