81358075 has 6 divisors (see below), whose sum is σ = 100884044. Its totient is φ = 65086440.

The previous prime is 81358001. The next prime is 81358087. The reversal of 81358075 is 57085318.

It is not a de Polignac number, because 81358075 - 2²³ = 72969467 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 1627137 + ... + 1627186.

Almost surely, 2^81358075 is an apocalyptic number.

81358075 is a deficient number, since it is larger than the sum of its proper divisors (19525969).

81358075 is a wasteful number, since it uses less digits than its factorization.

81358075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3254333 (or 3254328 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 81358075 is about 9019.8711188132. The cubic root of 81358075 is about 433.3115061327.

The spelling of 81358075 in words is "eighty-one million, three hundred fifty-eight thousand, seventy-five".