131543987 has 2 divisors, whose sum is σ = 131543988. Its totient is φ = 131543986.

The previous prime is 131543963. The next prime is 131543989. The reversal of 131543987 is 789345131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 131543987 - 2¹⁴ = 131527603 is a prime.

Together with 131543989, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131543989) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65771993 + 65771994.

It is an arithmetic number, because the mean of its divisors is an integer number (65771994).

Almost surely, 2^131543987 is an apocalyptic number.

131543987 is a deficient number, since it is larger than the sum of its proper divisors (1).

131543987 is an equidigital number, since it uses as much as digits as its factorization.

131543987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 41.

The square root of 131543987 is about 11469.2627051611. The cubic root of 131543987 is about 508.5773333196.

The spelling of 131543987 in words is "one hundred thirty-one million, five hundred forty-three thousand, nine hundred eighty-seven".