131887021 has 16 divisors (see below), whose sum is σ = 153930240. Its totient is φ = 110666160.

The previous prime is 131886971. The next prime is 131887033. The reversal of 131887021 is 120788131.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 131887021 - 2⁹ = 131886509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131887061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83166 + ... + 84736.

It is an arithmetic number, because the mean of its divisors is an integer number (9620640).

Almost surely, 2^131887021 is an apocalyptic number.

It is an amenable number.

131887021 is a deficient number, since it is larger than the sum of its proper divisors (22043219).

131887021 is a wasteful number, since it uses less digits than its factorization.

131887021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824.

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 131887021 is about 11484.2074606827. The cubic root of 131887021 is about 509.0190306596.

The spelling of 131887021 in words is "one hundred thirty-one million, eight hundred eighty-seven thousand, twenty-one".