11521901 has 4 divisors (see below), whose sum is σ = 11580000. Its totient is φ = 11463804.

The previous prime is 11521897. The next prime is 11521921. The reversal of 11521901 is 10912511.

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 11521901 - 2² = 11521897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11521921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28751 + ... + 29148.

It is an arithmetic number, because the mean of its divisors is an integer number (2895000).

Almost surely, 2^11521901 is an apocalyptic number.

It is an amenable number.

11521901 is a deficient number, since it is larger than the sum of its proper divisors (58099).

11521901 is an equidigital number, since it uses as much as digits as its factorization.

11521901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58098.

The product of its (nonzero) digits is 90, while the sum is 20.

The square root of 11521901 is about 3394.3925818915. The cubic root of 11521901 is about 225.8610692307.

The spelling of 11521901 in words is "eleven million, five hundred twenty-one thousand, nine hundred one".