81383583 has 8 divisors (see below), whose sum is σ = 108598528. Its totient is φ = 54212184.

The previous prime is 81383581. The next prime is 81383611. The reversal of 81383583 is 38538318.

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

It is not a de Polignac number, because 81383583 - 2¹ = 81383581 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 (81383581) 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, 6241 + ... + 14202.

It is an arithmetic number, because the mean of its divisors is an integer number (13574816).

Almost surely, 2^81383583 is an apocalyptic number.

81383583 is a deficient number, since it is larger than the sum of its proper divisors (27214945).

81383583 is a wasteful number, since it uses less digits than its factorization.

81383583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21773.

The product of its digits is 69120, while the sum is 39.

The square root of 81383583 is about 9021.2849971609. The cubic root of 81383583 is about 433.3567864361.

The spelling of 81383583 in words is "eighty-one million, three hundred eighty-three thousand, five hundred eighty-three".