891851 has 2 divisors, whose sum is σ = 891852. Its totient is φ = 891850.

The previous prime is 891829. The next prime is 891859. The reversal of 891851 is 158198.

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-891851 is a prime.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 891851.

It is not a weakly prime, because it can be changed into another prime (891859) 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, 445925 + 445926.

It is an arithmetic number, because the mean of its divisors is an integer number (445926).

2⁸⁹¹⁸⁵¹ is an apocalyptic number.

891851 is a deficient number, since it is larger than the sum of its proper divisors (1).

891851 is an equidigital number, since it uses as much as digits as its factorization.

891851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 32.

The square root of 891851 is about 944.3786316939. The cubic root of 891851 is about 96.2566555245.

The spelling of 891851 in words is "eight hundred ninety-one thousand, eight hundred fifty-one".