2131055405 has 4 divisors (see below), whose sum is σ = 2557266492. Its totient is φ = 1704844320.

The previous prime is 2131055389. The next prime is 2131055419. The reversal of 2131055405 is 5045501312.

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 801286249 + 1329769156 = 28307^2 + 36466^2 .

It is not a de Polignac number, because 2131055405 - 2⁴ = 2131055389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213105536 + ... + 213105545.

It is an arithmetic number, because the mean of its divisors is an integer number (639316623).

Almost surely, 2^2131055405 is an apocalyptic number.

It is an amenable number.

2131055405 is a deficient number, since it is larger than the sum of its proper divisors (426211087).

2131055405 is an equidigital number, since it uses as much as digits as its factorization.

2131055405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426211086.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 2131055405 is about 46163.3556514255. The cubic root of 2131055405 is about 1286.8608255401.

Adding to 2131055405 its reverse (5045501312), we get a palindrome (7176556717).

The spelling of 2131055405 in words is "two billion, one hundred thirty-one million, fifty-five thousand, four hundred five".