81495814 has 4 divisors (see below), whose sum is σ = 122243724. Its totient is φ = 40747906.

The previous prime is 81495809. The next prime is 81495863. The reversal of 81495814 is 41859418.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 as a sum of consecutive naturals, namely, 20373952 + ... + 20373955.

It is an arithmetic number, because the mean of its divisors is an integer number (30560931).

Almost surely, 2^81495814 is an apocalyptic number.

81495814 is a deficient number, since it is larger than the sum of its proper divisors (40747910).

81495814 is a wasteful number, since it uses less digits than its factorization.

81495814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40747909.

The product of its digits is 46080, while the sum is 40.

The square root of 81495814 is about 9027.5031985594. The cubic root of 81495814 is about 433.5558999994. Note that the first 3 decimals are identical.

The spelling of 81495814 in words is "eighty-one million, four hundred ninety-five thousand, eight hundred fourteen".