81458115 has 8 divisors (see below), whose sum is σ = 130333008. Its totient is φ = 43444320.

The previous prime is 81458093. The next prime is 81458123. The reversal of 81458115 is 51185418.

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

It is not a de Polignac number, because 81458115 - 2⁹ = 81457603 is a prime.

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, 2715256 + ... + 2715285.

It is an arithmetic number, because the mean of its divisors is an integer number (16291626).

Almost surely, 2^81458115 is an apocalyptic number.

81458115 is a deficient number, since it is larger than the sum of its proper divisors (48874893).

81458115 is a wasteful number, since it uses less digits than its factorization.

81458115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5430549.

The product of its digits is 6400, while the sum is 33.

The square root of 81458115 is about 9025.4149489096. The cubic root of 81458115 is about 433.4890370773.

The spelling of 81458115 in words is "eighty-one million, four hundred fifty-eight thousand, one hundred fifteen".