12991069 has 8 divisors (see below), whose sum is σ = 15989120. Its totient is φ = 10278576.

The previous prime is 12991061. The next prime is 12991073. The reversal of 12991069 is 96019921.

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

It is not a de Polignac number, because 12991069 - 2³ = 12991061 is a prime.

It is a super-2 number, since 2×12991069² = 337535747525522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12991061) by changing a digit.

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, 71289 + ... + 71470.

It is an arithmetic number, because the mean of its divisors is an integer number (1998640).

Almost surely, 2^12991069 is an apocalyptic number.

It is an amenable number.

12991069 is a deficient number, since it is larger than the sum of its proper divisors (2998051).

12991069 is a wasteful number, since it uses less digits than its factorization.

12991069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142779.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 12991069 is about 3604.3125558142. The cubic root of 12991069 is about 235.0796108724.

The spelling of 12991069 in words is "twelve million, nine hundred ninety-one thousand, sixty-nine".