81529115 has 16 divisors (see below), whose sum is σ = 100548000. Its totient is φ = 63425280.

The previous prime is 81529103. The next prime is 81529141. The reversal of 81529115 is 51192518.

It is not a de Polignac number, because 81529115 - 2⁴ = 81529099 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101897 + ... + 102693.

It is an arithmetic number, because the mean of its divisors is an integer number (6284250).

Almost surely, 2^81529115 is an apocalyptic number.

81529115 is a deficient number, since it is larger than the sum of its proper divisors (19018885).

81529115 is a wasteful number, since it uses less digits than its factorization.

81529115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342.

The product of its digits is 3600, while the sum is 32.

The square root of 81529115 is about 9029.3474293550. The cubic root of 81529115 is about 433.6149454817.

The spelling of 81529115 in words is "eighty-one million, five hundred twenty-nine thousand, one hundred fifteen".