1981783583 has 8 divisors (see below), whose sum is σ = 2135030688. Its totient is φ = 1828651104.

The previous prime is 1981783577. The next prime is 1981783607. The reversal of 1981783583 is 3853871891.

It is a happy number.

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 1981783583 - 2²⁰ = 1980735007 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 (1981783883) 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, 9110 + ... + 63612.

It is an arithmetic number, because the mean of its divisors is an integer number (266878836).

Almost surely, 2^1981783583 is an apocalyptic number.

1981783583 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1981783583 is a deficient number, since it is larger than the sum of its proper divisors (153247105).

1981783583 is a wasteful number, since it uses less digits than its factorization.

1981783583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57313.

The product of its digits is 1451520, while the sum is 53.

The square root of 1981783583 is about 44517.2279348119. The cubic root of 1981783583 is about 1256.0841693005.

The spelling of 1981783583 in words is "one billion, nine hundred eighty-one million, seven hundred eighty-three thousand, five hundred eighty-three".