81837695 has 4 divisors (see below), whose sum is σ = 98205240. Its totient is φ = 65470152.

The previous prime is 81837667. The next prime is 81837709. The reversal of 81837695 is 59673818.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81837695 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8183765 + ... + 8183774.

It is an arithmetic number, because the mean of its divisors is an integer number (24551310).

Almost surely, 2^81837695 is an apocalyptic number.

81837695 is a deficient number, since it is larger than the sum of its proper divisors (16367545).

81837695 is a wasteful number, since it uses less digits than its factorization.

81837695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16367544.

The product of its digits is 362880, while the sum is 47.

The square root of 81837695 is about 9046.4189047379. The cubic root of 81837695 is about 434.1613206059.

The spelling of 81837695 in words is "eighty-one million, eight hundred thirty-seven thousand, six hundred ninety-five".