81454894 has 4 divisors (see below), whose sum is σ = 122182344. Its totient is φ = 40727446.

The previous prime is 81454889. The next prime is 81454903. The reversal of 81454894 is 49845418.

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

It is a self number, because there is not a number n which added to its sum of digits gives 81454894.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20363722 + ... + 20363725.

It is an arithmetic number, because the mean of its divisors is an integer number (30545586).

Almost surely, 2^81454894 is an apocalyptic number.

81454894 is a deficient number, since it is larger than the sum of its proper divisors (40727450).

81454894 is a wasteful number, since it uses less digits than its factorization.

81454894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40727449.

The product of its digits is 184320, while the sum is 43.

The square root of 81454894 is about 9025.2365065964. The cubic root of 81454894 is about 433.4833233573.

The spelling of 81454894 in words is "eighty-one million, four hundred fifty-four thousand, eight hundred ninety-four".