81108516 has 12 divisors (see below), whose sum is σ = 189253232. Its totient is φ = 27036168.

The previous prime is 81108509. The next prime is 81108523. The reversal of 81108516 is 61580118.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81108509) and next prime (81108523).

It is a tau number, because it is divible by the number of its divisors (12).

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, 3379510 + ... + 3379533.

Almost surely, 2^81108516 is an apocalyptic number.

It is an amenable number.

81108516 is an abundant number, since it is smaller than the sum of its proper divisors (108144716).

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

81108516 is a wasteful number, since it uses less digits than its factorization.

81108516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6759050 (or 6759048 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 30.

The square root of 81108516 is about 9006.0266488613. The cubic root of 81108516 is about 432.8680035802.

The spelling of 81108516 in words is "eighty-one million, one hundred eight thousand, five hundred sixteen".