11723521 has 4 divisors (see below), whose sum is σ = 11872000. Its totient is φ = 11575044.

The previous prime is 11723519. The next prime is 11723527. The reversal of 11723521 is 12532711.

It is a happy number.

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 11723521 - 2¹ = 11723519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11723492 and 11723501.

It is not an unprimeable number, because it can be changed into a prime (11723527) 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, 74121 + ... + 74278.

It is an arithmetic number, because the mean of its divisors is an integer number (2968000).

Almost surely, 2^11723521 is an apocalyptic number.

It is an amenable number.

11723521 is a deficient number, since it is larger than the sum of its proper divisors (148479).

11723521 is an equidigital number, since it uses as much as digits as its factorization.

11723521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148478.

The product of its digits is 420, while the sum is 22.

The square root of 11723521 is about 3423.9627626480. The cubic root of 11723521 is about 227.1708947479.

The spelling of 11723521 in words is "eleven million, seven hundred twenty-three thousand, five hundred twenty-one".