9891061 has 2 divisors, whose sum is σ = 9891062. Its totient is φ = 9891060.

The previous prime is 9891053. The next prime is 9891097. The reversal of 9891061 is 1601989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9891025 + 36 = 3145^2 + 6^2 .

It is a cyclic number.

It is not a de Polignac number, because 9891061 - 2³ = 9891053 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9891041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4945530 + 4945531.

It is an arithmetic number, because the mean of its divisors is an integer number (4945531).

Almost surely, 2^9891061 is an apocalyptic number.

It is an amenable number.

9891061 is a deficient number, since it is larger than the sum of its proper divisors (1).

9891061 is an equidigital number, since it uses as much as digits as its factorization.

9891061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 9891061 is about 3145.0057233652. The cubic root of 9891061 is about 214.6582709039.

The spelling of 9891061 in words is "nine million, eight hundred ninety-one thousand, sixty-one".