891959441 has 2 divisors, whose sum is σ = 891959442. Its totient is φ = 891959440.

The previous prime is 891959437. The next prime is 891959443. The reversal of 891959441 is 144959198.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 533425216 + 358534225 = 23096^2 + 18935^2 .

It is a cyclic number.

It is not a de Polignac number, because 891959441 - 2² = 891959437 is a prime.

Together with 891959443, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 891959441.

It is not a weakly prime, because it can be changed into another prime (891959443) 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, 445979720 + 445979721.

It is an arithmetic number, because the mean of its divisors is an integer number (445979721).

Almost surely, 2^891959441 is an apocalyptic number.

It is an amenable number.

891959441 is a deficient number, since it is larger than the sum of its proper divisors (1).

891959441 is an equidigital number, since it uses as much as digits as its factorization.

891959441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 50.

The square root of 891959441 is about 29865.6900305350. The cubic root of 891959441 is about 962.6055667873.

The spelling of 891959441 in words is "eight hundred ninety-one million, nine hundred fifty-nine thousand, four hundred forty-one".