67391 has 2 divisors, whose sum is σ = 67392. Its totient is φ = 67390.

The previous prime is 67369. The next prime is 67399. The reversal of 67391 is 19376.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67391 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a plaindrome in base 6, base 9 and base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 67391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33695 + 33696.

It is an arithmetic number, because the mean of its divisors is an integer number (33696).

2⁶⁷³⁹¹ is an apocalyptic number.

67391 is a deficient number, since it is larger than the sum of its proper divisors (1).

67391 is an equidigital number, since it uses as much as digits as its factorization.

67391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134, while the sum is 26.

The square root of 67391 is about 259.5977657839. The cubic root of 67391 is about 40.6943360324.

The spelling of 67391 in words is "sixty-seven thousand, three hundred ninety-one".