12911997 has 32 divisors (see below), whose sum is σ = 20500480. Its totient is φ = 7076160.

The previous prime is 12911957. The next prime is 12911999. The reversal of 12911997 is 79911921.

12911997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12911997 - 2⁶ = 12911933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12911999) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71247 + ... + 71427.

It is an arithmetic number, because the mean of its divisors is an integer number (640640).

Almost surely, 2^12911997 is an apocalyptic number.

It is an amenable number.

12911997 is a deficient number, since it is larger than the sum of its proper divisors (7588483).

12911997 is a wasteful number, since it uses less digits than its factorization.

12911997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313.

The product of its digits is 10206, while the sum is 39.

The square root of 12911997 is about 3593.3267315957. The cubic root of 12911997 is about 234.6016913541.

The spelling of 12911997 in words is "twelve million, nine hundred eleven thousand, nine hundred ninety-seven".