67117691 has 2 divisors, whose sum is σ = 67117692. Its totient is φ = 67117690.

The previous prime is 67117681. The next prime is 67117723. The reversal of 67117691 is 19671176.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 67117691 - 2⁶ = 67117627 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67117681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33558845 + 33558846.

It is an arithmetic number, because the mean of its divisors is an integer number (33558846).

Almost surely, 2^67117691 is an apocalyptic number.

67117691 is a deficient number, since it is larger than the sum of its proper divisors (1).

67117691 is an equidigital number, since it uses as much as digits as its factorization.

67117691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15876, while the sum is 38.

The square root of 67117691 is about 8192.5387396094. The cubic root of 67117691 is about 406.3924856882.

It can be divided in two parts, 671176 and 91, that multiplied together give a palindrome (61077016).

The spelling of 67117691 in words is "sixty-seven million, one hundred seventeen thousand, six hundred ninety-one".