12991345 has 8 divisors (see below), whose sum is σ = 16410240. Its totient is φ = 9846000.

The previous prime is 12991339. The next prime is 12991351. The reversal of 12991345 is 54319921.

It is an interprime number because it is at equal distance from previous prime (12991339) and next prime (12991351).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12991345 - 2⁹ = 12990833 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12991345.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68281 + ... + 68470.

It is an arithmetic number, because the mean of its divisors is an integer number (2051280).

Almost surely, 2^12991345 is an apocalyptic number.

It is an amenable number.

12991345 is a deficient number, since it is larger than the sum of its proper divisors (3418895).

12991345 is a wasteful number, since it uses less digits than its factorization.

12991345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136775.

The product of its digits is 9720, while the sum is 34.

The square root of 12991345 is about 3604.3508430784. The cubic root of 12991345 is about 235.0812756446.

The spelling of 12991345 in words is "twelve million, nine hundred ninety-one thousand, three hundred forty-five".