891563 has 2 divisors, whose sum is σ = 891564. Its totient is φ = 891562.

The previous prime is 891559. The next prime is 891571. The reversal of 891563 is 365198.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 891563 - 2² = 891559 is a prime.

It is not a weakly prime, because it can be changed into another prime (891523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445781 + 445782.

It is an arithmetic number, because the mean of its divisors is an integer number (445782).

2⁸⁹¹⁵⁶³ is an apocalyptic number.

891563 is a deficient number, since it is larger than the sum of its proper divisors (1).

891563 is an equidigital number, since it uses as much as digits as its factorization.

891563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 32.

The square root of 891563 is about 944.2261381682. The cubic root of 891563 is about 96.2462932176.

The spelling of 891563 in words is "eight hundred ninety-one thousand, five hundred sixty-three".