12690509 has 4 divisors (see below), whose sum is σ = 13666716. Its totient is φ = 11714304.

The previous prime is 12690473. The next prime is 12690511. The reversal of 12690509 is 90509621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90509621 = 173 ⋅523177.

It can be written as a sum of positive squares in 2 ways, for example, as 8702500 + 3988009 = 2950^2 + 1997^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12690509 is a prime.

It is a super-2 number, since 2×12690509² = 322098037358162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12690589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 488084 + ... + 488109.

It is an arithmetic number, because the mean of its divisors is an integer number (3416679).

Almost surely, 2^12690509 is an apocalyptic number.

It is an amenable number.

12690509 is a deficient number, since it is larger than the sum of its proper divisors (976207).

12690509 is an equidigital number, since it uses as much as digits as its factorization.

12690509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976206.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 12690509 is about 3562.3740679496. The cubic root of 12690509 is about 233.2525214482.

The spelling of 12690509 in words is "twelve million, six hundred ninety thousand, five hundred nine".