11807521 has 4 divisors (see below), whose sum is σ = 12880944. Its totient is φ = 10734100.

The previous prime is 11807501. The next prime is 11807539. The reversal of 11807521 is 12570811.

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 11807521 - 2⁵ = 11807489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11807501) 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, 536695 + ... + 536716.

It is an arithmetic number, because the mean of its divisors is an integer number (3220236).

Almost surely, 2^11807521 is an apocalyptic number.

11807521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11807521 is a deficient number, since it is larger than the sum of its proper divisors (1073423).

11807521 is a wasteful number, since it uses less digits than its factorization.

11807521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073422.

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 11807521 is about 3436.2073569562. The cubic root of 11807521 is about 227.7121701367.

The spelling of 11807521 in words is "eleven million, eight hundred seven thousand, five hundred twenty-one".