81814454 has 16 divisors (see below), whose sum is σ = 124830720. Its totient is φ = 40209000.

The previous prime is 81814433. The next prime is 81814471. The reversal of 81814454 is 45441818.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38627 + ... + 40689.

It is an arithmetic number, because the mean of its divisors is an integer number (7801920).

Almost surely, 2^81814454 is an apocalyptic number.

81814454 is a deficient number, since it is larger than the sum of its proper divisors (43016266).

81814454 is a wasteful number, since it uses less digits than its factorization.

81814454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2395.

The product of its digits is 20480, while the sum is 35.

The square root of 81814454 is about 9045.1342720824. The cubic root of 81814454 is about 434.1202177107.

The spelling of 81814454 in words is "eighty-one million, eight hundred fourteen thousand, four hundred fifty-four".