81083671 has 4 divisors (see below), whose sum is σ = 84609072. Its totient is φ = 77558272.

The previous prime is 81083657. The next prime is 81083699. The reversal of 81083671 is 17638018.

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 81083671 - 2²¹ = 78986519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81083371) 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, 1762666 + ... + 1762711.

It is an arithmetic number, because the mean of its divisors is an integer number (21152268).

Almost surely, 2^81083671 is an apocalyptic number.

81083671 is a deficient number, since it is larger than the sum of its proper divisors (3525401).

81083671 is a wasteful number, since it uses less digits than its factorization.

81083671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3525400.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 81083671 is about 9004.6471890908. The cubic root of 81083671 is about 432.8238006433.

The spelling of 81083671 in words is "eighty-one million, eighty-three thousand, six hundred seventy-one".