81508595 has 32 divisors (see below), whose sum is σ = 116028288. Its totient is φ = 53803008.

The previous prime is 81508577. The next prime is 81508597. The reversal of 81508595 is 59580518.

It is not a de Polignac number, because 81508595 - 2¹⁶ = 81443059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81508597) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 146057 + ... + 146613.

It is an arithmetic number, because the mean of its divisors is an integer number (3625884).

Almost surely, 2^81508595 is an apocalyptic number.

81508595 is a deficient number, since it is larger than the sum of its proper divisors (34519693).

81508595 is a wasteful number, since it uses less digits than its factorization.

81508595 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719.

The product of its (nonzero) digits is 72000, while the sum is 41.

The square root of 81508595 is about 9028.2110631066. The cubic root of 81508595 is about 433.5785636923.

The spelling of 81508595 in words is "eighty-one million, five hundred eight thousand, five hundred ninety-five".