135873172213 has 4 divisors (see below), whose sum is σ = 135874699020. Its totient is φ = 135871645408.

The previous prime is 135873172177. The next prime is 135873172247. The reversal of 135873172213 is 312271378531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 128008675089 + 7864497124 = 357783^2 + 88682^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135873172213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 135873172213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135873176213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 621070 + ... + 810847.

It is an arithmetic number, because the mean of its divisors is an integer number (33968674755).

Almost surely, 2^135873172213 is an apocalyptic number.

It is an amenable number.

135873172213 is a deficient number, since it is larger than the sum of its proper divisors (1526807).

135873172213 is an equidigital number, since it uses as much as digits as its factorization.

135873172213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1526806.

The product of its digits is 211680, while the sum is 43.

The spelling of 135873172213 in words is "one hundred thirty-five billion, eight hundred seventy-three million, one hundred seventy-two thousand, two hundred thirteen".