81308855 has 8 divisors (see below), whose sum is σ = 99027312. Its totient is φ = 64075968.

The previous prime is 81308849. The next prime is 81308873. The reversal of 81308855 is 55880318.

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 81308855 - 2⁴ = 81308839 is a prime.

It is a super-2 number, since 2×81308855² = 13222259802822050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121022 + ... + 121691.

It is an arithmetic number, because the mean of its divisors is an integer number (12378414).

Almost surely, 2^81308855 is an apocalyptic number.

81308855 is a deficient number, since it is larger than the sum of its proper divisors (17718457).

81308855 is a wasteful number, since it uses less digits than its factorization.

81308855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242785.

The product of its (nonzero) digits is 38400, while the sum is 38.

The square root of 81308855 is about 9017.1422856690. The cubic root of 81308855 is about 433.2241069216.

The spelling of 81308855 in words is "eighty-one million, three hundred eight thousand, eight hundred fifty-five".