81075165 has 8 divisors (see below), whose sum is σ = 129720288. Its totient is φ = 43240080.

The previous prime is 81075157. The next prime is 81075179. The reversal of 81075165 is 56157018.

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

It is not a de Polignac number, because 81075165 - 2³ = 81075157 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2702491 + ... + 2702520.

It is an arithmetic number, because the mean of its divisors is an integer number (16215036).

Almost surely, 2^81075165 is an apocalyptic number.

It is an amenable number.

81075165 is a deficient number, since it is larger than the sum of its proper divisors (48645123).

81075165 is a wasteful number, since it uses less digits than its factorization.

81075165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5405019.

The product of its (nonzero) digits is 8400, while the sum is 33.

The square root of 81075165 is about 9004.1748650279. The cubic root of 81075165 is about 432.8086651339.

The spelling of 81075165 in words is "eighty-one million, seventy-five thousand, one hundred sixty-five".