81083847 has 8 divisors (see below), whose sum is σ = 116428144. Its totient is φ = 49897728.

The previous prime is 81083833. The next prime is 81083881. The reversal of 81083847 is 74838018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-81083847 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 2079073 = 81083847 / (8 + 1 + 0 + 8 + 3 + 8 + 4 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81083347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1039498 + ... + 1039575.

It is an arithmetic number, because the mean of its divisors is an integer number (14553518).

Almost surely, 2^81083847 is an apocalyptic number.

81083847 is a deficient number, since it is larger than the sum of its proper divisors (35344297).

81083847 is a wasteful number, since it uses less digits than its factorization.

81083847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2079089.

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 81083847 is about 9004.6569618170. The cubic root of 81083847 is about 432.8241138051.

The spelling of 81083847 in words is "eighty-one million, eighty-three thousand, eight hundred forty-seven".