13673509 has 2 divisors, whose sum is σ = 13673510. Its totient is φ = 13673508.

The previous prime is 13673507. The next prime is 13673519. The reversal of 13673509 is 90537631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13068225 + 605284 = 3615^2 + 778^2 .

It is a cyclic number.

It is not a de Polignac number, because 13673509 - 2¹ = 13673507 is a prime.

Together with 13673507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13673501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6836754 + 6836755.

It is an arithmetic number, because the mean of its divisors is an integer number (6836755).

Almost surely, 2^13673509 is an apocalyptic number.

It is an amenable number.

13673509 is a deficient number, since it is larger than the sum of its proper divisors (1).

13673509 is an equidigital number, since it uses as much as digits as its factorization.

13673509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17010, while the sum is 34.

The square root of 13673509 is about 3697.7708149641. The cubic root of 13673509 is about 239.1259235000.

The spelling of 13673509 in words is "thirteen million, six hundred seventy-three thousand, five hundred nine".