81458255 has 4 divisors (see below), whose sum is σ = 97749912. Its totient is φ = 65166600.

The previous prime is 81458233. The next prime is 81458281. The reversal of 81458255 is 55285418.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-81458255 is a prime.

It is a super-4 number, since 4×81458255⁴ (a number of 33 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8145821 + ... + 8145830.

It is an arithmetic number, because the mean of its divisors is an integer number (24437478).

Almost surely, 2^81458255 is an apocalyptic number.

81458255 is a deficient number, since it is larger than the sum of its proper divisors (16291657).

81458255 is a wasteful number, since it uses less digits than its factorization.

81458255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16291656.

The product of its digits is 64000, while the sum is 38.

The square root of 81458255 is about 9025.4227047823. The cubic root of 81458255 is about 433.4892854194.

The spelling of 81458255 in words is "eighty-one million, four hundred fifty-eight thousand, two hundred fifty-five".