12991177 has 2 divisors, whose sum is σ = 12991178. Its totient is φ = 12991176.

The previous prime is 12991171. The next prime is 12991189. The reversal of 12991177 is 77119921.

12991177 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12787776 + 203401 = 3576^2 + 451^2 .

It is a cyclic number.

It is not a de Polignac number, because 12991177 - 2⁷ = 12991049 is a prime.

It is not a weakly prime, because it can be changed into another prime (12991171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6495588 + 6495589.

It is an arithmetic number, because the mean of its divisors is an integer number (6495589).

Almost surely, 2^12991177 is an apocalyptic number.

It is an amenable number.

12991177 is a deficient number, since it is larger than the sum of its proper divisors (1).

12991177 is an equidigital number, since it uses as much as digits as its factorization.

12991177 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7938, while the sum is 37.

The square root of 12991177 is about 3604.3275378356. The cubic root of 12991177 is about 235.0802623078.

The spelling of 12991177 in words is "twelve million, nine hundred ninety-one thousand, one hundred seventy-seven".