80909993 has 4 divisors (see below), whose sum is σ = 81150420. Its totient is φ = 80669568.

The previous prime is 80909981. The next prime is 80910007. The reversal of 80909993 is 39990908.

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 14845609 + 66064384 = 3853^2 + 8128^2 .

It is a cyclic number.

It is not a de Polignac number, because 80909993 - 2¹⁰ = 80908969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80909903) 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 3 ways as a sum of consecutive naturals, for example, 119708 + ... + 120381.

It is an arithmetic number, because the mean of its divisors is an integer number (20287605).

Almost surely, 2^80909993 is an apocalyptic number.

It is an amenable number.

80909993 is a deficient number, since it is larger than the sum of its proper divisors (240427).

80909993 is a wasteful number, since it uses less digits than its factorization.

80909993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240426.

The product of its (nonzero) digits is 157464, while the sum is 47.

The square root of 80909993 is about 8994.9982212338. The cubic root of 80909993 is about 432.5145492783.

The spelling of 80909993 in words is "eighty million, nine hundred nine thousand, nine hundred ninety-three".