67000091 has 2 divisors, whose sum is σ = 67000092. Its totient is φ = 67000090.

The previous prime is 67000069. The next prime is 67000093. The reversal of 67000091 is 19000076.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67000091 - 2¹⁰ = 66999067 is a prime.

It is a Sophie Germain prime.

Together with 67000093, it forms a pair of twin primes.

It is a Chen prime.

67000091 is a modest number, since divided by 91 gives 67 as remainder.

It is not a weakly prime, because it can be changed into another prime (67000093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33500045 + 33500046.

It is an arithmetic number, because the mean of its divisors is an integer number (33500046).

Almost surely, 2^67000091 is an apocalyptic number.

67000091 is a deficient number, since it is larger than the sum of its proper divisors (1).

67000091 is an equidigital number, since it uses as much as digits as its factorization.

67000091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 67000091 is about 8185.3583305803. The cubic root of 67000091 is about 406.1549939255.

The spelling of 67000091 in words is "sixty-seven million, ninety-one", and thus it is an aban number and an uban number.