13643009 has 4 divisors (see below), whose sum is σ = 13846704. Its totient is φ = 13439316.

The previous prime is 13642987. The next prime is 13643011. The reversal of 13643009 is 90034631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90034631 = 263 ⋅342337.

It is a cyclic number.

It is not a de Polignac number, because 13643009 - 2⁸ = 13642753 is a prime.

It is a super-2 number, since 2×13643009² = 372263389148162, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13643029) 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, 101747 + ... + 101880.

It is an arithmetic number, because the mean of its divisors is an integer number (3461676).

Almost surely, 2^13643009 is an apocalyptic number.

It is an amenable number.

13643009 is a deficient number, since it is larger than the sum of its proper divisors (203695).

13643009 is an equidigital number, since it uses as much as digits as its factorization.

13643009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203694.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 13643009 is about 3693.6444062741. The cubic root of 13643009 is about 238.9479937963.

The spelling of 13643009 in words is "thirteen million, six hundred forty-three thousand, nine".