13729918109 has 2 divisors, whose sum is σ = 13729918110. Its totient is φ = 13729918108.

The previous prime is 13729918093. The next prime is 13729918121. The reversal of 13729918109 is 90181992731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13717562884 + 12355225 = 117122^2 + 3515^2 .

It is a cyclic number.

It is not a de Polignac number, because 13729918109 - 2⁴ = 13729918093 is a prime.

It is a super-2 number, since 2×13729918109² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13729918129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6864959054 + 6864959055.

It is an arithmetic number, because the mean of its divisors is an integer number (6864959055).

Almost surely, 2^13729918109 is an apocalyptic number.

It is an amenable number.

13729918109 is a deficient number, since it is larger than the sum of its proper divisors (1).

13729918109 is an equidigital number, since it uses as much as digits as its factorization.

13729918109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 50.

The spelling of 13729918109 in words is "thirteen billion, seven hundred twenty-nine million, nine hundred eighteen thousand, one hundred nine".