81819102 has 8 divisors (see below), whose sum is σ = 163638216. Its totient is φ = 27273032.

The previous prime is 81819083. The next prime is 81819107. The reversal of 81819102 is 20191818.

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

81819102 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 81819102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81819107) 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, 6818253 + ... + 6818264.

It is an arithmetic number, because the mean of its divisors is an integer number (20454777).

Almost surely, 2^81819102 is an apocalyptic number.

81819102 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.

81819102 is a wasteful number, since it uses less digits than its factorization.

81819102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13636522.

The product of its (nonzero) digits is 1152, while the sum is 30.

The square root of 81819102 is about 9045.3912021537. The cubic root of 81819102 is about 434.1284385587.

The spelling of 81819102 in words is "eighty-one million, eight hundred nineteen thousand, one hundred two".