81546913 has 16 divisors (see below), whose sum is σ = 96287616. Its totient is φ = 67616640.

The previous prime is 81546911. The next prime is 81546967. The reversal of 81546913 is 31964518.

It is not a de Polignac number, because 81546913 - 2¹ = 81546911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81546911) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 25578 + ... + 28588.

It is an arithmetic number, because the mean of its divisors is an integer number (6017976).

Almost surely, 2^81546913 is an apocalyptic number.

It is an amenable number.

81546913 is a deficient number, since it is larger than the sum of its proper divisors (14740703).

81546913 is a wasteful number, since it uses less digits than its factorization.

81546913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3144.

The product of its digits is 25920, while the sum is 37.

The square root of 81546913 is about 9030.3329395986. The cubic root of 81546913 is about 433.6464962445.

The spelling of 81546913 in words is "eighty-one million, five hundred forty-six thousand, nine hundred thirteen".