891061 has 2 divisors, whose sum is σ = 891062. Its totient is φ = 891060.

The previous prime is 891049. The next prime is 891067. The reversal of 891061 is 160198.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 820836 + 70225 = 906^2 + 265^2 .

It is a cyclic number.

It is not a de Polignac number, because 891061 - 2⁷ = 890933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (891067) 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, 445530 + 445531.

It is an arithmetic number, because the mean of its divisors is an integer number (445531).

2⁸⁹¹⁰⁶¹ is an apocalyptic number.

It is an amenable number.

891061 is a deficient number, since it is larger than the sum of its proper divisors (1).

891061 is an equidigital number, since it uses as much as digits as its factorization.

891061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 891061 is about 943.9602745879. The cubic root of 891061 is about 96.2282258048.

The spelling of 891061 in words is "eight hundred ninety-one thousand, sixty-one".