81083903847 has 4 divisors (see below), whose sum is σ = 108111871800. Its totient is φ = 54055935896.

The previous prime is 81083903843. The next prime is 81083903863. The reversal of 81083903847 is 74830938018.

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

It is a cyclic number.

It is not a de Polignac number, because 81083903847 - 2² = 81083903843 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81083903847.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81083903843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13513983972 + ... + 13513983977.

It is an arithmetic number, because the mean of its divisors is an integer number (27027967950).

Almost surely, 2^81083903847 is an apocalyptic number.

81083903847 is a deficient number, since it is larger than the sum of its proper divisors (27027967953).

81083903847 is a wasteful number, since it uses less digits than its factorization.

81083903847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27027967952.

The product of its (nonzero) digits is 1161216, while the sum is 51.

The spelling of 81083903847 in words is "eighty-one billion, eighty-three million, nine hundred three thousand, eight hundred forty-seven".