131931287 has 2 divisors, whose sum is σ = 131931288. Its totient is φ = 131931286.

The previous prime is 131931281. The next prime is 131931329. The reversal of 131931287 is 782139131.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (782139131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131931287 - 2⁶ = 131931223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131931281) 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 as a sum of consecutive naturals, namely, 65965643 + 65965644.

It is an arithmetic number, because the mean of its divisors is an integer number (65965644).

Almost surely, 2^131931287 is an apocalyptic number.

131931287 is a deficient number, since it is larger than the sum of its proper divisors (1).

131931287 is an equidigital number, since it uses as much as digits as its factorization.

131931287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 35.

The square root of 131931287 is about 11486.1345543224. The cubic root of 131931287 is about 509.0759726186.

The spelling of 131931287 in words is "one hundred thirty-one million, nine hundred thirty-one thousand, two hundred eighty-seven".