131320405 has 16 divisors (see below), whose sum is σ = 159408000. Its totient is φ = 103848640.

The previous prime is 131320403. The next prime is 131320411. The reversal of 131320405 is 504023131.

It is not a de Polignac number, because 131320405 - 2¹ = 131320403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131320403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267210 + ... + 267700.

It is an arithmetic number, because the mean of its divisors is an integer number (9963000).

Almost surely, 2^131320405 is an apocalyptic number.

It is an amenable number.

131320405 is a deficient number, since it is larger than the sum of its proper divisors (28087595).

131320405 is a wasteful number, since it uses less digits than its factorization.

131320405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 131320405 is about 11459.5115515453. The cubic root of 131320405 is about 508.2890312253.

Adding to 131320405 its reverse (504023131), we get a palindrome (635343536).

The spelling of 131320405 in words is "one hundred thirty-one million, three hundred twenty thousand, four hundred five".