13731709309 has 2 divisors, whose sum is σ = 13731709310. Its totient is φ = 13731709308.

The previous prime is 13731709283. The next prime is 13731709361. The reversal of 13731709309 is 90390713731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12231696409 + 1500012900 = 110597^2 + 38730^2 .

It is a cyclic number.

It is not a de Polignac number, because 13731709309 - 2⁷ = 13731709181 is a prime.

It is a super-3 number, since 3×13731709309³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13731709399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6865854654 + 6865854655.

It is an arithmetic number, because the mean of its divisors is an integer number (6865854655).

Almost surely, 2^13731709309 is an apocalyptic number.

It is an amenable number.

13731709309 is a deficient number, since it is larger than the sum of its proper divisors (1).

13731709309 is an equidigital number, since it uses as much as digits as its factorization.

13731709309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 107163, while the sum is 43.

The spelling of 13731709309 in words is "thirteen billion, seven hundred thirty-one million, seven hundred nine thousand, three hundred nine".