Search a number
3391 is a prime number

3391 has 2 divisors, whose sum is σ = 3392. Its totient is φ = 3390.

The previous prime is 3389. The next prime is 3407. The reversal of 3391 is 1933.

It is a happy number.

It is an a-pointer prime, because the next prime (3407) can be obtained adding 3391 to its sum of digits (16).

It is a weak prime.

It is an emirp because it is prime and its reverse (1933) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3391 - 21 = 3389 is a prime.

It is a super-2 number, since 2×33912 = 22997762, which contains 22 as substring.

Together with 3389, it forms a pair of twin primes.

It is a plaindrome in base 9.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1695 + 1696.

It is an arithmetic number, because the mean of its divisors is an integer number (1696).

23391 is an apocalyptic number.

3391 is a deficient number, since it is larger than the sum of its proper divisors (1).

3391 is an equidigital number, since it uses as much as digits as its factorization.

3391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81, while the sum is 16.

The square root of 3391 is about 58.2322934462. The cubic root of 3391 is about 15.0236663443.

Subtracting from 3391 its sum of digits (16), we obtain a cube (3375 = 153).

It can be divided in two parts, 33 and 91, that multiplied together give a palindrome (3003).

The spelling of 3391 in words is "three thousand, three hundred ninety-one".