81458173 has 8 divisors (see below), whose sum is σ = 85512960. Its totient is φ = 77492640.

The previous prime is 81458171. The next prime is 81458213. The reversal of 81458173 is 37185418.

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 81458173 - 2¹ = 81458171 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81458171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20440 + ... + 24097.

It is an arithmetic number, because the mean of its divisors is an integer number (10689120).

Almost surely, 2^81458173 is an apocalyptic number.

It is an amenable number.

81458173 is a deficient number, since it is larger than the sum of its proper divisors (4054787).

81458173 is a wasteful number, since it uses less digits than its factorization.

81458173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44627.

The product of its digits is 26880, while the sum is 37.

The square root of 81458173 is about 9025.4181620576. The cubic root of 81458173 is about 433.4891399619.

The spelling of 81458173 in words is "eighty-one million, four hundred fifty-eight thousand, one hundred seventy-three".