81596485 has 8 divisors (see below), whose sum is σ = 97975800. Its totient is φ = 65237184.

The previous prime is 81596477. The next prime is 81596531. The reversal of 81596485 is 58469518.

It can be written as a sum of positive squares in 4 ways, for example, as 8031556 + 73564929 = 2834^2 + 8577^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81596485 - 2³ = 81596477 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6291 + ... + 14239.

It is an arithmetic number, because the mean of its divisors is an integer number (12246975).

Almost surely, 2^81596485 is an apocalyptic number.

It is an amenable number.

81596485 is a deficient number, since it is larger than the sum of its proper divisors (16379315).

81596485 is a wasteful number, since it uses less digits than its factorization.

81596485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10007.

The product of its digits is 345600, while the sum is 46.

The square root of 81596485 is about 9033.0772718936. The cubic root of 81596485 is about 433.7343490271.

The spelling of 81596485 in words is "eighty-one million, five hundred ninety-six thousand, four hundred eighty-five".