9001691 has 2 divisors, whose sum is σ = 9001692. Its totient is φ = 9001690.

The previous prime is 9001667. The next prime is 9001723. The reversal of 9001691 is 1961009.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9001691 - 2⁶ = 9001627 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9001691.

It is not a weakly prime, because it can be changed into another prime (9001621) 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, 4500845 + 4500846.

It is an arithmetic number, because the mean of its divisors is an integer number (4500846).

Almost surely, 2^9001691 is an apocalyptic number.

9001691 is a deficient number, since it is larger than the sum of its proper divisors (1).

9001691 is an equidigital number, since it uses as much as digits as its factorization.

9001691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 9001691 is about 3000.2818200962. The cubic root of 9001691 is about 208.0214089773.

The spelling of 9001691 in words is "nine million, one thousand, six hundred ninety-one".