13121709 has 8 divisors (see below), whose sum is σ = 17528640. Its totient is φ = 8731296.

The previous prime is 13121683. The next prime is 13121729. The reversal of 13121709 is 90712131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13121709 - 2⁸ = 13121453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2137 + ... + 5550.

It is an arithmetic number, because the mean of its divisors is an integer number (2191080).

Almost surely, 2^13121709 is an apocalyptic number.

It is an amenable number.

13121709 is a deficient number, since it is larger than the sum of its proper divisors (4406931).

13121709 is an equidigital number, since it uses as much as digits as its factorization.

13121709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8259.

The product of its (nonzero) digits is 378, while the sum is 24.

The square root of 13121709 is about 3622.3899569207. The cubic root of 13121709 is about 235.8649819000.

The spelling of 13121709 in words is "thirteen million, one hundred twenty-one thousand, seven hundred nine".