81901082 has 8 divisors (see below), whose sum is σ = 122928096. Its totient is φ = 40925052.

The previous prime is 81901073. The next prime is 81901123. The reversal of 81901082 is 28010918.

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 8438 + ... + 15329.

It is an arithmetic number, because the mean of its divisors is an integer number (15366012).

Almost surely, 2^81901082 is an apocalyptic number.

81901082 is a deficient number, since it is larger than the sum of its proper divisors (41027014).

81901082 is a wasteful number, since it uses less digits than its factorization.

81901082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25492.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 81901082 is about 9049.9216571195. The cubic root of 81901082 is about 434.2733842113.

The spelling of 81901082 in words is "eighty-one million, nine hundred one thousand, eighty-two".