891967 has 2 divisors, whose sum is σ = 891968. Its totient is φ = 891966.

The previous prime is 891929. The next prime is 891983. The reversal of 891967 is 769198.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-891967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (891907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445983 + 445984.

It is an arithmetic number, because the mean of its divisors is an integer number (445984).

2⁸⁹¹⁹⁶⁷ is an apocalyptic number.

891967 is a deficient number, since it is larger than the sum of its proper divisors (1).

891967 is an equidigital number, since it uses as much as digits as its factorization.

891967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 40.

The square root of 891967 is about 944.4400457414. The cubic root of 891967 is about 96.2608286012.

The spelling of 891967 in words is "eight hundred ninety-one thousand, nine hundred sixty-seven".