80520421 has 6 divisors (see below), whose sum is σ = 80873970. Its totient is φ = 80168256.

The previous prime is 80520403. The next prime is 80520437. The reversal of 80520421 is 12402508.

It can be written as a sum of positive squares in 3 ways, for example, as 220900 + 80299521 = 470^2 + 8961^2 .

It is not a de Polignac number, because 80520421 - 2¹⁵ = 80487653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 80520392 and 80520401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80520481) 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 5 ways as a sum of consecutive naturals, for example, 113215 + ... + 113923.

It is an arithmetic number, because the mean of its divisors is an integer number (13478995).

Almost surely, 2^80520421 is an apocalyptic number.

It is an amenable number.

80520421 is a deficient number, since it is larger than the sum of its proper divisors (353549).

80520421 is an frugal number, since it uses more digits than its factorization.

80520421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1383 (or 1046 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 80520421 is about 8973.3171681380. The cubic root of 80520421 is about 431.8192634587.

Adding to 80520421 its reverse (12402508), we get a palindrome (92922929).

The spelling of 80520421 in words is "eighty million, five hundred twenty thousand, four hundred twenty-one".