81119982 has 16 divisors (see below), whose sum is σ = 164662272. Its totient is φ = 26636280.

The previous prime is 81119981. The next prime is 81119993. The reversal of 81119982 is 28991118.

It is a self number, because there is not a number n which added to its sum of digits gives 81119982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81119981) 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, 100494 + ... + 101297.

It is an arithmetic number, because the mean of its divisors is an integer number (10291392).

Almost surely, 2^81119982 is an apocalyptic number.

81119982 is an abundant number, since it is smaller than the sum of its proper divisors (83542290).

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

81119982 is a wasteful number, since it uses less digits than its factorization.

81119982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201863.

The product of its digits is 10368, while the sum is 39.

The square root of 81119982 is about 9006.6632000980. The cubic root of 81119982 is about 432.8884002492. Note that the first 3 decimals are identical.

The spelling of 81119982 in words is "eighty-one million, one hundred nineteen thousand, nine hundred eighty-two".