81088559 has 8 divisors (see below), whose sum is σ = 83075328. Its totient is φ = 79124760.

The previous prime is 81088541. The next prime is 81088573. The reversal of 81088559 is 95588018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81088559 - 2⁸ = 81088303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81058559) 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 7 ways as a sum of consecutive naturals, for example, 1514 + ... + 12824.

It is an arithmetic number, because the mean of its divisors is an integer number (10384416).

Almost surely, 2^81088559 is an apocalyptic number.

81088559 is a deficient number, since it is larger than the sum of its proper divisors (1986769).

81088559 is a wasteful number, since it uses less digits than its factorization.

81088559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11485.

The product of its (nonzero) digits is 115200, while the sum is 44.

The square root of 81088559 is about 9004.9186004094. The cubic root of 81088559 is about 432.8324978331.

The spelling of 81088559 in words is "eighty-one million, eighty-eight thousand, five hundred fifty-nine".