891552791 has 2 divisors, whose sum is σ = 891552792. Its totient is φ = 891552790.

The previous prime is 891552769. The next prime is 891552793. The reversal of 891552791 is 197255198.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 891552791 - 2¹⁰ = 891551767 is a prime.

Together with 891552793, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_45599618 and since 891552791 and 45599618 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (891552793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445776395 + 445776396.

It is an arithmetic number, because the mean of its divisors is an integer number (445776396).

Almost surely, 2^891552791 is an apocalyptic number.

891552791 is a deficient number, since it is larger than the sum of its proper divisors (1).

891552791 is an equidigital number, since it uses as much as digits as its factorization.

891552791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 47.

The square root of 891552791 is about 29858.8812750913. The cubic root of 891552791 is about 962.4592585442.

The spelling of 891552791 in words is "eight hundred ninety-one million, five hundred fifty-two thousand, seven hundred ninety-one".