11319721 has 4 divisors (see below), whose sum is σ = 12936832. Its totient is φ = 9702612.

The previous prime is 11319713. The next prime is 11319727. The reversal of 11319721 is 12791311.

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.

It is a cyclic number.

It is not a de Polignac number, because 11319721 - 2³ = 11319713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11319727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 808545 + ... + 808558.

It is an arithmetic number, because the mean of its divisors is an integer number (3234208).

Almost surely, 2^11319721 is an apocalyptic number.

It is an amenable number.

11319721 is a deficient number, since it is larger than the sum of its proper divisors (1617111).

11319721 is an equidigital number, since it uses as much as digits as its factorization.

11319721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1617110.

The product of its digits is 378, while the sum is 25.

The square root of 11319721 is about 3364.4793059254. The cubic root of 11319721 is about 224.5321703295.

The spelling of 11319721 in words is "eleven million, three hundred nineteen thousand, seven hundred twenty-one".