80731321 has 12 divisors (see below), whose sum is σ = 89223316. Its totient is φ = 72990720.

The previous prime is 80731319. The next prime is 80731333. The reversal of 80731321 is 12313708.

It can be written as a sum of positive squares in 2 ways, for example, as 7868025 + 72863296 = 2805^2 + 8536^2 .

It is not a de Polignac number, because 80731321 - 2¹ = 80731319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80761321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21625 + ... + 25081.

Almost surely, 2^80731321 is an apocalyptic number.

It is an amenable number.

80731321 is a deficient number, since it is larger than the sum of its proper divisors (8491995).

80731321 is a wasteful number, since it uses less digits than its factorization.

80731321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3672 (or 3661 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 80731321 is about 8985.0609903328. The cubic root of 80731321 is about 432.1959434194.

The spelling of 80731321 in words is "eighty million, seven hundred thirty-one thousand, three hundred twenty-one".