891533891 has 2 divisors, whose sum is σ = 891533892. Its totient is φ = 891533890.

The previous prime is 891533857. The next prime is 891533899. The reversal of 891533891 is 198335198.

891533891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 891533891 - 2¹⁸ = 891271747 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (891533899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445766945 + 445766946.

It is an arithmetic number, because the mean of its divisors is an integer number (445766946).

Almost surely, 2^891533891 is an apocalyptic number.

891533891 is a deficient number, since it is larger than the sum of its proper divisors (1).

891533891 is an equidigital number, since it uses as much as digits as its factorization.

891533891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 47.

The square root of 891533891 is about 29858.5647846644. The cubic root of 891533891 is about 962.4524574482.

The spelling of 891533891 in words is "eight hundred ninety-one million, five hundred thirty-three thousand, eight hundred ninety-one".