80138321 has 4 divisors (see below), whose sum is σ = 80488500. Its totient is φ = 79788144.

The previous prime is 80138299. The next prime is 80138347. The reversal of 80138321 is 12383108.

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 76807696 + 3330625 = 8764^2 + 1825^2 .

It is a cyclic number.

It is not a de Polignac number, because 80138321 - 2¹⁸ = 79876177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (80138351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174746 + ... + 175203.

It is an arithmetic number, because the mean of its divisors is an integer number (20122125).

Almost surely, 2^80138321 is an apocalyptic number.

It is an amenable number.

80138321 is a deficient number, since it is larger than the sum of its proper divisors (350179).

80138321 is a wasteful number, since it uses less digits than its factorization.

80138321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350178.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 80138321 is about 8952.0009495084. Note that the first 3 decimals coincide. The cubic root of 80138321 is about 431.1351313188.

The spelling of 80138321 in words is "eighty million, one hundred thirty-eight thousand, three hundred twenty-one".