81080559 has 24 divisors (see below), whose sum is σ = 134083872. Its totient is φ = 46249920.

The previous prime is 81080557. The next prime is 81080563. The reversal of 81080559 is 95508018.

It is not a de Polignac number, because 81080559 - 2¹ = 81080557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81080557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66237 + ... + 67449.

It is an arithmetic number, because the mean of its divisors is an integer number (5586828).

Almost surely, 2^81080559 is an apocalyptic number.

81080559 is a deficient number, since it is larger than the sum of its proper divisors (53003313).

81080559 is a wasteful number, since it uses less digits than its factorization.

81080559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2287 (or 2284 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 36.

The square root of 81080559 is about 9004.4743877697. The cubic root of 81080559 is about 432.8182632978.

The spelling of 81080559 in words is "eighty-one million, eighty thousand, five hundred fifty-nine".