424668521 has 4 divisors (see below), whose sum is σ = 430485972. Its totient is φ = 418851072.

The previous prime is 424668511. The next prime is 424668533. The reversal of 424668521 is 125866424.

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 275560000 + 149108521 = 16600^2 + 12211^2 .

It is a cyclic number.

It is not a de Polignac number, because 424668521 - 2²² = 420474217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (424668511) 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, 2908616 + ... + 2908761.

It is an arithmetic number, because the mean of its divisors is an integer number (107621493).

Almost surely, 2^424668521 is an apocalyptic number.

It is an amenable number.

424668521 is a deficient number, since it is larger than the sum of its proper divisors (5817451).

424668521 is an equidigital number, since it uses as much as digits as its factorization.

424668521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5817450.

The product of its digits is 92160, while the sum is 38.

The square root of 424668521 is about 20607.4870132192. The cubic root of 424668521 is about 751.6517793479.

The spelling of 424668521 in words is "four hundred twenty-four million, six hundred sixty-eight thousand, five hundred twenty-one".