9897091 has 16 divisors (see below), whose sum is σ = 10771200. Its totient is φ = 9072000.

The previous prime is 9897071. The next prime is 9897109. The reversal of 9897091 is 1907989.

It is a 7-Lehmer number, since φ(9897091) divides (9897091-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 9897091 - 2⁵ = 9897059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9897001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90745 + ... + 90853.

It is an arithmetic number, because the mean of its divisors is an integer number (673200).

Almost surely, 2^9897091 is an apocalyptic number.

9897091 is a deficient number, since it is larger than the sum of its proper divisors (874109).

9897091 is a wasteful number, since it uses less digits than its factorization.

9897091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270.

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 9897091 is about 3145.9642401019. The cubic root of 9897091 is about 214.7018835633.

The spelling of 9897091 in words is "nine million, eight hundred ninety-seven thousand, ninety-one".