423113521 has 4 divisors (see below), whose sum is σ = 423857700. Its totient is φ = 422369344.

The previous prime is 423113519. The next prime is 423113549. The reversal of 423113521 is 125311324.

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 215032896 + 208080625 = 14664^2 + 14425^2 .

It is a cyclic number.

It is not a de Polignac number, because 423113521 - 2¹ = 423113519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 423113492 and 423113501.

It is not an unprimeable number, because it can be changed into a prime (423113591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 371236 + ... + 372373.

It is an arithmetic number, because the mean of its divisors is an integer number (105964425).

Almost surely, 2^423113521 is an apocalyptic number.

It is an amenable number.

423113521 is a deficient number, since it is larger than the sum of its proper divisors (744179).

423113521 is an equidigital number, since it uses as much as digits as its factorization.

423113521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744178.

The product of its digits is 720, while the sum is 22.

The square root of 423113521 is about 20569.7234060159. The cubic root of 423113521 is about 750.7332213188.

Adding to 423113521 its reverse (125311324), we get a palindrome (548424845).

The spelling of 423113521 in words is "four hundred twenty-three million, one hundred thirteen thousand, five hundred twenty-one".