135673520309 has 2 divisors, whose sum is σ = 135673520310. Its totient is φ = 135673520308.

The previous prime is 135673520303. The next prime is 135673520329. The reversal of 135673520309 is 903025376531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96193022500 + 39480497809 = 310150^2 + 198697^2 .

It is a cyclic number.

It is not a de Polignac number, because 135673520309 - 2⁴ = 135673520293 is a prime.

It is a super-2 number, since 2×135673520309² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 135673520309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135673520303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67836760154 + 67836760155.

It is an arithmetic number, because the mean of its divisors is an integer number (67836760155).

Almost surely, 2^135673520309 is an apocalyptic number.

It is an amenable number.

135673520309 is a deficient number, since it is larger than the sum of its proper divisors (1).

135673520309 is an equidigital number, since it uses as much as digits as its factorization.

135673520309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 510300, while the sum is 44.

The spelling of 135673520309 in words is "one hundred thirty-five billion, six hundred seventy-three million, five hundred twenty thousand, three hundred nine".