81409182 has 8 divisors (see below), whose sum is σ = 162818376. Its totient is φ = 27136392.

The previous prime is 81409117. The next prime is 81409187. The reversal of 81409182 is 28190418.

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

81409182 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81409187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6784093 + ... + 6784104.

It is an arithmetic number, because the mean of its divisors is an integer number (20352297).

Almost surely, 2^81409182 is an apocalyptic number.

81409182 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81409182 is a wasteful number, since it uses less digits than its factorization.

81409182 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13568202.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 81409182 is about 9022.7036967862. The cubic root of 81409182 is about 433.4022187662.

The spelling of 81409182 in words is "eighty-one million, four hundred nine thousand, one hundred eighty-two".