67049891 has 2 divisors, whose sum is σ = 67049892. Its totient is φ = 67049890.

The previous prime is 67049867. The next prime is 67049893. The reversal of 67049891 is 19894076.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67049891 - 2¹⁴ = 67033507 is a prime.

It is a super-2 number, since 2×67049891² = 8991375766223762, which contains 22 as substring.

Together with 67049893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67049893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33524945 + 33524946.

It is an arithmetic number, because the mean of its divisors is an integer number (33524946).

Almost surely, 2^67049891 is an apocalyptic number.

67049891 is a deficient number, since it is larger than the sum of its proper divisors (1).

67049891 is an equidigital number, since it uses as much as digits as its factorization.

67049891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 67049891 is about 8188.3997826193. The cubic root of 67049891 is about 406.2555983134.

The spelling of 67049891 in words is "sixty-seven million, forty-nine thousand, eight hundred ninety-one".