81673115 has 16 divisors (see below), whose sum is σ = 107654400. Its totient is φ = 59206752.

The previous prime is 81673099. The next prime is 81673121. The reversal of 81673115 is 51137618.

It is a cyclic number.

It is not a de Polignac number, because 81673115 - 2⁴ = 81673099 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16505 + ... + 20874.

It is an arithmetic number, because the mean of its divisors is an integer number (6728400).

Almost surely, 2^81673115 is an apocalyptic number.

81673115 is a deficient number, since it is larger than the sum of its proper divisors (25981285).

81673115 is a wasteful number, since it uses less digits than its factorization.

81673115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37426.

The product of its digits is 5040, while the sum is 32.

The square root of 81673115 is about 9037.3179096455. The cubic root of 81673115 is about 433.8700847103.

The spelling of 81673115 in words is "eighty-one million, six hundred seventy-three thousand, one hundred fifteen".