12991207 has 4 divisors (see below), whose sum is σ = 13017240. Its totient is φ = 12965176.

The previous prime is 12991189. The next prime is 12991229. The reversal of 12991207 is 70219921.

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 12991207 - 2¹¹ = 12989159 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12991267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12253 + ... + 13270.

It is an arithmetic number, because the mean of its divisors is an integer number (3254310).

Almost surely, 2^12991207 is an apocalyptic number.

12991207 is a deficient number, since it is larger than the sum of its proper divisors (26033).

12991207 is an equidigital number, since it uses as much as digits as its factorization.

12991207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26032.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 12991207 is about 3604.3316994971. The cubic root of 12991207 is about 235.0804432615.

The spelling of 12991207 in words is "twelve million, nine hundred ninety-one thousand, two hundred seven".