80563421 has 4 divisors (see below), whose sum is σ = 83341500. Its totient is φ = 77785344.

The previous prime is 80563367. The next prime is 80563429. The reversal of 80563421 is 12436508.

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 62805625 + 17757796 = 7925^2 + 4214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80563421 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 2778049 = 80563421 / (8 + 0 + 5 + 6 + 3 + 4 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80563429) 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, 1388996 + ... + 1389053.

It is an arithmetic number, because the mean of its divisors is an integer number (20835375).

Almost surely, 2^80563421 is an apocalyptic number.

It is an amenable number.

80563421 is a deficient number, since it is larger than the sum of its proper divisors (2778079).

80563421 is a wasteful number, since it uses less digits than its factorization.

80563421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2778078.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 80563421 is about 8975.7128407720. The cubic root of 80563421 is about 431.8961173540.

Adding to 80563421 its reverse (12436508), we get a palindrome (92999929).

The spelling of 80563421 in words is "eighty million, five hundred sixty-three thousand, four hundred twenty-one".