23471521 has 4 divisors (see below), whose sum is σ = 23493652. Its totient is φ = 23449392.

The previous prime is 23471501. The next prime is 23471531. The reversal of 23471521 is 12517432.

It is a happy number.

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 287296 + 23184225 = 536^2 + 4815^2 .

It is a cyclic number.

It is not a de Polignac number, because 23471521 - 2⁹ = 23471009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23471501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9390 + ... + 11623.

It is an arithmetic number, because the mean of its divisors is an integer number (5873413).

Almost surely, 2^23471521 is an apocalyptic number.

It is an amenable number.

23471521 is a deficient number, since it is larger than the sum of its proper divisors (22131).

23471521 is a wasteful number, since it uses less digits than its factorization.

23471521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22130.

The product of its digits is 1680, while the sum is 25.

The square root of 23471521 is about 4844.7415823757. The cubic root of 23471521 is about 286.3169623985.

Adding to 23471521 its reverse (12517432), we get a palindrome (35988953).

The spelling of 23471521 in words is "twenty-three million, four hundred seventy-one thousand, five hundred twenty-one".