2131315405 has 16 divisors (see below), whose sum is σ = 2706160320. Its totient is φ = 1606929408.

The previous prime is 2131315393. The next prime is 2131315409. The reversal of 2131315405 is 5045131312.

It is a happy number.

It is not a de Polignac number, because 2131315405 - 2²¹ = 2129218253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2131315405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131315409) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 39787 + ... + 76456.

It is an arithmetic number, because the mean of its divisors is an integer number (169135020).

Almost surely, 2^2131315405 is an apocalyptic number.

It is an amenable number.

2131315405 is a deficient number, since it is larger than the sum of its proper divisors (574844915).

2131315405 is a wasteful number, since it uses less digits than its factorization.

2131315405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116460.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 2131315405 is about 46166.1716519791. The cubic root of 2131315405 is about 1286.9131580147.

Adding to 2131315405 its reverse (5045131312), we get a palindrome (7176446717).

The spelling of 2131315405 in words is "two billion, one hundred thirty-one million, three hundred fifteen thousand, four hundred five".