11976521 has 4 divisors (see below), whose sum is σ = 11987844. Its totient is φ = 11965200.

The previous prime is 11976511. The next prime is 11976533. The reversal of 11976521 is 12567911.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6864400 + 5112121 = 2620^2 + 2261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11976521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11976511) 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, 3890 + ... + 6251.

It is an arithmetic number, because the mean of its divisors is an integer number (2996961).

Almost surely, 2^11976521 is an apocalyptic number.

It is an amenable number.

11976521 is a deficient number, since it is larger than the sum of its proper divisors (11323).

11976521 is a wasteful number, since it uses less digits than its factorization.

11976521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11322.

The product of its digits is 3780, while the sum is 32.

The square root of 11976521 is about 3460.7110541043. The cubic root of 11976521 is about 228.7934357682.

The spelling of 11976521 in words is "eleven million, nine hundred seventy-six thousand, five hundred twenty-one".