81006055 has 8 divisors (see below), whose sum is σ = 104684832. Its totient is φ = 59819808.

The previous prime is 81006053. The next prime is 81006059. The reversal of 81006055 is 55060018.

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 81006055 - 2¹ = 81006053 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 (81006053) 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, 623059 + ... + 623188.

It is an arithmetic number, because the mean of its divisors is an integer number (13085604).

Almost surely, 2^81006055 is an apocalyptic number.

81006055 is a deficient number, since it is larger than the sum of its proper divisors (23678777).

81006055 is a wasteful number, since it uses less digits than its factorization.

81006055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1246265.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 81006055 is about 9000.3363826026. The cubic root of 81006055 is about 432.6856520843.

The spelling of 81006055 in words is "eighty-one million, six thousand, fifty-five".