11520997 has 4 divisors (see below), whose sum is σ = 11529196. Its totient is φ = 11512800.

The previous prime is 11520991. The next prime is 11521007. The reversal of 11520997 is 79902511.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 591361 + 10929636 = 769^2 + 3306^2 .

It is a cyclic number.

It is not a de Polignac number, because 11520997 - 2⁷ = 11520869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11520991) 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, 1398 + ... + 4999.

It is an arithmetic number, because the mean of its divisors is an integer number (2882299).

Almost surely, 2^11520997 is an apocalyptic number.

It is an amenable number.

11520997 is a deficient number, since it is larger than the sum of its proper divisors (8199).

11520997 is an equidigital number, since it uses as much as digits as its factorization.

11520997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8198.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 11520997 is about 3394.2594184888. The cubic root of 11520997 is about 225.8551621110.

It can be divided in two parts, 115 and 20997, that added together give a palindrome (21112).

The spelling of 11520997 in words is "eleven million, five hundred twenty thousand, nine hundred ninety-seven".