81055871 has 8 divisors (see below), whose sum is σ = 89148864. Its totient is φ = 73228320.

The previous prime is 81055867. The next prime is 81055879. The reversal of 81055871 is 17855018.

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 81055871 - 2² = 81055867 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 (81055879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65720 + ... + 66941.

It is an arithmetic number, because the mean of its divisors is an integer number (11143608).

Almost surely, 2^81055871 is an apocalyptic number.

81055871 is a deficient number, since it is larger than the sum of its proper divisors (8092993).

81055871 is a wasteful number, since it uses less digits than its factorization.

81055871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132721.

The product of its (nonzero) digits is 11200, while the sum is 35.

The square root of 81055871 is about 9003.1034093806. The cubic root of 81055871 is about 432.7743296178.

The spelling of 81055871 in words is "eighty-one million, fifty-five thousand, eight hundred seventy-one".