9971207 has 2 divisors, whose sum is σ = 9971208. Its totient is φ = 9971206.

The previous prime is 9971179. The next prime is 9971209. The reversal of 9971207 is 7021799.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9971207 - 2⁸ = 9970951 is a prime.

Together with 9971209, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9971209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4985603 + 4985604.

It is an arithmetic number, because the mean of its divisors is an integer number (4985604).

Almost surely, 2^9971207 is an apocalyptic number.

9971207 is a deficient number, since it is larger than the sum of its proper divisors (1).

9971207 is an equidigital number, since it uses as much as digits as its factorization.

9971207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7938, while the sum is 35.

The square root of 9971207 is about 3157.7218053527. The cubic root of 9971207 is about 215.2364947688.

The spelling of 9971207 in words is "nine million, nine hundred seventy-one thousand, two hundred seven".