10991207 has 2 divisors, whose sum is σ = 10991208. Its totient is φ = 10991206.

The previous prime is 10991173. The next prime is 10991213. The reversal of 10991207 is 70219901.

It is a strong prime.

It is an emirp because it is prime and its reverse (70219901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10991207 - 2¹⁰ = 10990183 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10991207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10991237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5495603 + 5495604.

It is an arithmetic number, because the mean of its divisors is an integer number (5495604).

Almost surely, 2^10991207 is an apocalyptic number.

10991207 is a deficient number, since it is larger than the sum of its proper divisors (1).

10991207 is an equidigital number, since it uses as much as digits as its factorization.

10991207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 10991207 is about 3315.2989307150. The cubic root of 10991207 is about 222.3387342997.

The spelling of 10991207 in words is "ten million, nine hundred ninety-one thousand, two hundred seven".