81983599 has 8 divisors (see below), whose sum is σ = 83750832. Its totient is φ = 80233920.

The previous prime is 81983597. The next prime is 81983617. The reversal of 81983599 is 99538918.

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

It is a cyclic number.

It is not a de Polignac number, because 81983599 - 2¹ = 81983597 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 (81983597) 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, 5277 + ... + 13849.

It is an arithmetic number, because the mean of its divisors is an integer number (10468854).

Almost surely, 2^81983599 is an apocalyptic number.

81983599 is a deficient number, since it is larger than the sum of its proper divisors (1767233).

81983599 is a wasteful number, since it uses less digits than its factorization.

81983599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8777.

The product of its digits is 699840, while the sum is 52.

The square root of 81983599 is about 9054.4794991209. The cubic root of 81983599 is about 434.4191816696.

The spelling of 81983599 in words is "eighty-one million, nine hundred eighty-three thousand, five hundred ninety-nine".