81295585 has 32 divisors (see below), whose sum is σ = 120130560. Its totient is φ = 51565248.

The previous prime is 81295573. The next prime is 81295597. The reversal of 81295585 is 58559218.

It is an interprime number because it is at equal distance from previous prime (81295573) and next prime (81295597).

It is not a de Polignac number, because 81295585 - 2⁵ = 81295553 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 27174 + ... + 30016.

It is an arithmetic number, because the mean of its divisors is an integer number (3754080).

Almost surely, 2^81295585 is an apocalyptic number.

It is an amenable number.

81295585 is a deficient number, since it is larger than the sum of its proper divisors (38834975).

81295585 is a wasteful number, since it uses less digits than its factorization.

81295585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2917.

The product of its digits is 144000, while the sum is 43.

The square root of 81295585 is about 9016.4064349385. The cubic root of 81295585 is about 433.2005375466.

The spelling of 81295585 in words is "eighty-one million, two hundred ninety-five thousand, five hundred eighty-five".