13731409 has 2 divisors, whose sum is σ = 13731410. Its totient is φ = 13731408.

The previous prime is 13731407. The next prime is 13731439. The reversal of 13731409 is 90413731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11881809 + 1849600 = 3447^2 + 1360^2 .

It is an emirp because it is prime and its reverse (90413731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13731409 - 2¹ = 13731407 is a prime.

Together with 13731407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13731401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6865704 + 6865705.

It is an arithmetic number, because the mean of its divisors is an integer number (6865705).

Almost surely, 2^13731409 is an apocalyptic number.

It is an amenable number.

13731409 is a deficient number, since it is larger than the sum of its proper divisors (1).

13731409 is an equidigital number, since it uses as much as digits as its factorization.

13731409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 13731409 is about 3705.5915856986. The cubic root of 13731409 is about 239.4629716858.

The spelling of 13731409 in words is "thirteen million, seven hundred thirty-one thousand, four hundred nine".