9971291 has 4 divisors (see below), whose sum is σ = 10877784. Its totient is φ = 9064800.

The previous prime is 9971287. The next prime is 9971303. The reversal of 9971291 is 1921799.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9971291 - 2² = 9971287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9971251) 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 in 3 ways as a sum of consecutive naturals, for example, 453230 + ... + 453251.

It is an arithmetic number, because the mean of its divisors is an integer number (2719446).

Almost surely, 2^9971291 is an apocalyptic number.

9971291 is a deficient number, since it is larger than the sum of its proper divisors (906493).

9971291 is a wasteful number, since it uses less digits than its factorization.

9971291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906492.

The product of its digits is 10206, while the sum is 38.

The square root of 9971291 is about 3157.7351060531. The cubic root of 9971291 is about 215.2370991696.

The spelling of 9971291 in words is "nine million, nine hundred seventy-one thousand, two hundred ninety-one".