81411115 has 12 divisors (see below), whose sum is σ = 100952352. Its totient is φ = 63024240.

The previous prime is 81411107. The next prime is 81411139. The reversal of 81411115 is 51111418.

It is not a de Polignac number, because 81411115 - 2³ = 81411107 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3667 + ... + 13276.

It is an arithmetic number, because the mean of its divisors is an integer number (8412696).

Almost surely, 2^81411115 is an apocalyptic number.

81411115 is a deficient number, since it is larger than the sum of its proper divisors (19541237).

81411115 is a wasteful number, since it uses less digits than its factorization.

81411115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17010 (or 16979 counting only the distinct ones).

The product of its digits is 160, while the sum is 22.

The square root of 81411115 is about 9022.8108148182. The cubic root of 81411115 is about 433.4056490094.

The spelling of 81411115 in words is "eighty-one million, four hundred eleven thousand, one hundred fifteen".