12991051 has 2 divisors, whose sum is σ = 12991052. Its totient is φ = 12991050.

The previous prime is 12991049. The next prime is 12991057. The reversal of 12991051 is 15019921.

12991051 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 is a cyclic number.

It is not a de Polignac number, because 12991051 - 2¹ = 12991049 is a prime.

Together with 12991049, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12991057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6495525 + 6495526.

It is an arithmetic number, because the mean of its divisors is an integer number (6495526).

Almost surely, 2^12991051 is an apocalyptic number.

12991051 is a deficient number, since it is larger than the sum of its proper divisors (1).

12991051 is an equidigital number, since it uses as much as digits as its factorization.

12991051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 810, while the sum is 28.

The square root of 12991051 is about 3604.3100588046. The cubic root of 12991051 is about 235.0795022995.

The spelling of 12991051 in words is "twelve million, nine hundred ninety-one thousand, fifty-one".