12811969 has 4 divisors (see below), whose sum is σ = 12929620. Its totient is φ = 12694320.

The previous prime is 12811961. The next prime is 12811973. The reversal of 12811969 is 96911821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4326400 + 8485569 = 2080^2 + 2913^2 .

It is a cyclic number.

It is not a de Polignac number, because 12811969 - 2³ = 12811961 is a prime.

It is a super-2 number, since 2×12811969² = 328293099313922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12811961) 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 3 ways as a sum of consecutive naturals, for example, 58662 + ... + 58879.

It is an arithmetic number, because the mean of its divisors is an integer number (3232405).

Almost surely, 2^12811969 is an apocalyptic number.

It is an amenable number.

12811969 is a deficient number, since it is larger than the sum of its proper divisors (117651).

12811969 is a wasteful number, since it uses less digits than its factorization.

12811969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117650.

The product of its digits is 7776, while the sum is 37.

The square root of 12811969 is about 3579.3810917532. The cubic root of 12811969 is about 233.9943079435.

The spelling of 12811969 in words is "twelve million, eight hundred eleven thousand, nine hundred sixty-nine".