3191 has 2 divisors, whose sum is σ = 3192. Its totient is φ = 3190.
The previous prime is 3187. The next prime is 3203. The reversal of 3191 is 1913.
It is a weak prime.
It is an emirp because it is prime and its reverse (1913) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 3191 - 22 = 3187 is a prime.
It is a Chen prime.
It is a plaindrome in base 14.
It is a nialpdrome in base 16.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (3121) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1595 + 1596.
It is an arithmetic number, because the mean of its divisors is an integer number (1596).
23191 is an apocalyptic number.
3191 is a deficient number, since it is larger than the sum of its proper divisors (1).
3191 is an equidigital number, since it uses as much as digits as its factorization.
3191 is an evil number, because the sum of its binary digits is even.
The product of its digits is 27, while the sum is 14.
The square root of 3191 is about 56.4889369700. The cubic root of 3191 is about 14.7222979045.
The spelling of 3191 in words is "three thousand, one hundred ninety-one".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.064 sec. • engine limits •