2135171791873 has 4 divisors (see below), whose sum is σ = 2139803401428. Its totient is φ = 2130540182320.

The previous prime is 2135171791843. The next prime is 2135171791957. The reversal of 2135171791873 is 3781971715312.

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 1003909814209 + 1131261977664 = 1001953^2 + 1063608^2 .

It is a cyclic number.

It is not a de Polignac number, because 2135171791873 - 2¹⁷ = 2135171660801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2135171791843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2315804086 + ... + 2315805007.

It is an arithmetic number, because the mean of its divisors is an integer number (534950850357).

Almost surely, 2^{2135171791873} is an apocalyptic number.

It is an amenable number.

2135171791873 is a deficient number, since it is larger than the sum of its proper divisors (4631609555).

2135171791873 is an equidigital number, since it uses as much as digits as its factorization.

2135171791873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4631609554.

The product of its digits is 2222640, while the sum is 55.

The spelling of 2135171791873 in words is "two trillion, one hundred thirty-five billion, one hundred seventy-one million, seven hundred ninety-one thousand, eight hundred seventy-three".