191983 has 8 divisors (see below), whose sum is σ = 216576.
Its totient is φ = 168600.
The previous prime is 191977. The next prime is 191999. The reversal of 191983 is 389191.
It can be divided in two parts, 1919 and 83, that added together give a palindrome (2002).
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-191983 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (31).
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (191903) 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, 60 + ... + 622.
It is an arithmetic number, because the mean of its divisors is an integer number (27072).
2191983 is an apocalyptic number.
191983 is a deficient number, since it is larger than the sum of its proper divisors (24593).
191983 is a wasteful number, since it uses less digits than its factorization.
191983 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 605.
The product of its digits is 1944, while the sum is 31.
The square root of 191983 is about 438.1586470675.
The cubic root of 191983 is about 57.6882801063.
The spelling of 191983 in words is "one hundred ninety-one thousand, nine hundred eighty-three".