81682583 has 4 divisors (see below), whose sum is σ = 81769248. Its totient is φ = 81595920.

The previous prime is 81682553. The next prime is 81682597. The reversal of 81682583 is 38528618.

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 81682583 - 2¹⁸ = 81420439 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81682583.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81682543) 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, 41903 + ... + 43808.

It is an arithmetic number, because the mean of its divisors is an integer number (20442312).

Almost surely, 2^81682583 is an apocalyptic number.

81682583 is a deficient number, since it is larger than the sum of its proper divisors (86665).

81682583 is an equidigital number, since it uses as much as digits as its factorization.

81682583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86664.

The product of its digits is 92160, while the sum is 41.

The square root of 81682583 is about 9037.8417224468. The cubic root of 81682583 is about 433.8868496038.

The spelling of 81682583 in words is "eighty-one million, six hundred eighty-two thousand, five hundred eighty-three".