81084017 has 4 divisors (see below), whose sum is σ = 92667456. Its totient is φ = 69500580.

The previous prime is 81083987. The next prime is 81084037. The reversal of 81084017 is 71048018.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81084017 - 2⁶ = 81083953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81084037) 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, 5791709 + ... + 5791722.

It is an arithmetic number, because the mean of its divisors is an integer number (23166864).

Almost surely, 2^81084017 is an apocalyptic number.

It is an amenable number.

81084017 is a deficient number, since it is larger than the sum of its proper divisors (11583439).

81084017 is a wasteful number, since it uses less digits than its factorization.

81084017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11583438.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 81084017 is about 9004.6664013721. Note that the first 3 decimals coincide. The cubic root of 81084017 is about 432.8244162906.

The spelling of 81084017 in words is "eighty-one million, eighty-four thousand, seventeen".