131428587 has 16 divisors (see below), whose sum is σ = 180385280. Its totient is φ = 85082400.

The previous prime is 131428571. The next prime is 131428589. The reversal of 131428587 is 785824131.

It is not a de Polignac number, because 131428587 - 2⁴ = 131428571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131428589) 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, 9912 + ... + 19002.

It is an arithmetic number, because the mean of its divisors is an integer number (11274080).

Almost surely, 2^131428587 is an apocalyptic number.

131428587 is a deficient number, since it is larger than the sum of its proper divisors (48956693).

131428587 is an equidigital number, since it uses as much as digits as its factorization.

131428587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9234.

The product of its digits is 53760, while the sum is 39.

The square root of 131428587 is about 11464.2307635532. The cubic root of 131428587 is about 508.4285694060.

The spelling of 131428587 in words is "one hundred thirty-one million, four hundred twenty-eight thousand, five hundred eighty-seven".