81500927 has 4 divisors (see below), whose sum is σ = 81607680. Its totient is φ = 81394176.

The previous prime is 81500921. The next prime is 81500929. The reversal of 81500927 is 72900518.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81500927 - 2⁶ = 81500863 is a prime.

It is a super-2 number, since 2×81500927² = 13284802203718658, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81500893 and 81500902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81500921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52223 + ... + 53760.

It is an arithmetic number, because the mean of its divisors is an integer number (20401920).

Almost surely, 2^81500927 is an apocalyptic number.

81500927 is a deficient number, since it is larger than the sum of its proper divisors (106753).

81500927 is a wasteful number, since it uses less digits than its factorization.

81500927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106752.

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

The square root of 81500927 is about 9027.7863842694. The cubic root of 81500927 is about 433.5649668249.

The spelling of 81500927 in words is "eighty-one million, five hundred thousand, nine hundred twenty-seven".