2731173121 has 4 divisors (see below), whose sum is σ = 2731288644. Its totient is φ = 2731057600.

The previous prime is 2731173119. The next prime is 2731173127. The reversal of 2731173121 is 1213711372.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2179862721 + 551310400 = 46689^2 + 23480^2 .

It is a cyclic number.

It is not a de Polignac number, because 2731173121 - 2¹ = 2731173119 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 2731173121.

It is not an unprimeable number, because it can be changed into a prime (2731173127) 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, 8020 + ... + 74341.

It is an arithmetic number, because the mean of its divisors is an integer number (682822161).

Almost surely, 2^2731173121 is an apocalyptic number.

It is an amenable number.

2731173121 is a deficient number, since it is larger than the sum of its proper divisors (115523).

2731173121 is an equidigital number, since it uses as much as digits as its factorization.

2731173121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115522.

The product of its digits is 1764, while the sum is 28.

The square root of 2731173121 is about 52260.6268714795. The cubic root of 2731173121 is about 1397.8151500746.

Adding to 2731173121 its reverse (1213711372), we get a palindrome (3944884493).

The spelling of 2731173121 in words is "two billion, seven hundred thirty-one million, one hundred seventy-three thousand, one hundred twenty-one".