80865549 has 24 divisors (see below), whose sum is σ = 124925112. Its totient is φ = 50227200.

The previous prime is 80865529. The next prime is 80865553. The reversal of 80865549 is 94556808.

It can be written as a sum of positive squares in 4 ways, for example, as 66096900 + 14768649 = 8130^2 + 3843^2 .

It is not a de Polignac number, because 80865549 - 2⁵ = 80865517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80865529) 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 23 ways as a sum of consecutive naturals, for example, 12837 + ... + 18069.

It is an arithmetic number, because the mean of its divisors is an integer number (5205213).

Almost surely, 2^80865549 is an apocalyptic number.

It is an amenable number.

80865549 is a deficient number, since it is larger than the sum of its proper divisors (44059563).

80865549 is a wasteful number, since it uses less digits than its factorization.

80865549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5357 (or 5354 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The square root of 80865549 is about 8992.5273977898. The cubic root of 80865549 is about 432.4353411086.

The spelling of 80865549 in words is "eighty million, eight hundred sixty-five thousand, five hundred forty-nine".