11597921 has 4 divisors (see below), whose sum is σ = 11761344. Its totient is φ = 11434500.

The previous prime is 11597899. The next prime is 11597951. The reversal of 11597921 is 12979511.

11597921 is digitally balanced in base 3, 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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11597921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11597951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81605 + ... + 81746.

It is an arithmetic number, because the mean of its divisors is an integer number (2940336).

Almost surely, 2^11597921 is an apocalyptic number.

It is an amenable number.

11597921 is a deficient number, since it is larger than the sum of its proper divisors (163423).

11597921 is an equidigital number, since it uses as much as digits as its factorization.

11597921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163422.

The product of its digits is 5670, while the sum is 35.

The square root of 11597921 is about 3405.5720517998. The cubic root of 11597921 is about 226.3567147143.

The spelling of 11597921 in words is "eleven million, five hundred ninety-seven thousand, nine hundred twenty-one".