13637009 has 4 divisors (see below), whose sum is σ = 14439204. Its totient is φ = 12834816.

The previous prime is 13636981. The next prime is 13637011. The reversal of 13637009 is 90073631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90073631 = 31 ⋅2905601.

It can be written as a sum of positive squares in 2 ways, for example, as 8673025 + 4963984 = 2945^2 + 2228^2 .

It is a cyclic number.

It is not a de Polignac number, because 13637009 - 2¹⁶ = 13571473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13637089) 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, 401072 + ... + 401105.

It is an arithmetic number, because the mean of its divisors is an integer number (3609801).

Almost surely, 2^13637009 is an apocalyptic number.

It is an amenable number.

13637009 is a deficient number, since it is larger than the sum of its proper divisors (802195).

13637009 is an equidigital number, since it uses as much as digits as its factorization.

13637009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802194.

The product of its (nonzero) digits is 3402, while the sum is 29.

The square root of 13637009 is about 3692.8321109956. The cubic root of 13637009 is about 238.9129600246.

The spelling of 13637009 in words is "thirteen million, six hundred thirty-seven thousand, nine".