81454893 has 8 divisors (see below), whose sum is σ = 116960928. Its totient is φ = 50126064.

The previous prime is 81454889. The next prime is 81454903. The reversal of 81454893 is 39845418.

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

It is not a de Polignac number, because 81454893 - 2² = 81454889 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81454193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1044255 + ... + 1044332.

It is an arithmetic number, because the mean of its divisors is an integer number (14620116).

Almost surely, 2^81454893 is an apocalyptic number.

It is an amenable number.

81454893 is a deficient number, since it is larger than the sum of its proper divisors (35506035).

81454893 is a wasteful number, since it uses less digits than its factorization.

81454893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2088603.

The product of its digits is 138240, while the sum is 42.

The square root of 81454893 is about 9025.2364511962. The cubic root of 81454893 is about 433.4833215833.

The spelling of 81454893 in words is "eighty-one million, four hundred fifty-four thousand, eight hundred ninety-three".