421080809 has 4 divisors (see below), whose sum is σ = 422053716. Its totient is φ = 420107904.

The previous prime is 421080799. The next prime is 421080839. The reversal of 421080809 is 908080124.

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 27931225 + 393149584 = 5285^2 + 19828^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421080809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421080839) 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, 485804 + ... + 486669.

It is an arithmetic number, because the mean of its divisors is an integer number (105513429).

Almost surely, 2^421080809 is an apocalyptic number.

It is an amenable number.

421080809 is a deficient number, since it is larger than the sum of its proper divisors (972907).

421080809 is an equidigital number, since it uses as much as digits as its factorization.

421080809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972906.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 421080809 is about 20520.2536290368. The cubic root of 421080809 is about 749.5290726614.

The spelling of 421080809 in words is "four hundred twenty-one million, eighty thousand, eight hundred nine".