81481108 has 6 divisors (see below), whose sum is σ = 142591946. Its totient is φ = 40740552.

The previous prime is 81481093. The next prime is 81481109. The reversal of 81481108 is 80118418.

It can be written as a sum of positive squares in only one way, i.e., 64192144 + 17288964 = 8012^2 + 4158^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81481108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81481109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10185135 + ... + 10185142.

Almost surely, 2^81481108 is an apocalyptic number.

It is an amenable number.

81481108 is a deficient number, since it is larger than the sum of its proper divisors (61110838).

81481108 is a wasteful number, since it uses less digits than its factorization.

81481108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20370281 (or 20370279 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 31.

The square root of 81481108 is about 9026.6886508841. The cubic root of 81481108 is about 433.5298199008.

The spelling of 81481108 in words is "eighty-one million, four hundred eighty-one thousand, one hundred eight".