131543989 has 2 divisors, whose sum is σ = 131543990. Its totient is φ = 131543988.

The previous prime is 131543987. The next prime is 131544001. The reversal of 131543989 is 989345131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78180964 + 53363025 = 8842^2 + 7305^2 .

It is a cyclic number.

It is not a de Polignac number, because 131543989 - 2¹ = 131543987 is a prime.

Together with 131543987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131543987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65771994 + 65771995.

It is an arithmetic number, because the mean of its divisors is an integer number (65771995).

Almost surely, 2^131543989 is an apocalyptic number.

It is an amenable number.

131543989 is a deficient number, since it is larger than the sum of its proper divisors (1).

131543989 is an equidigital number, since it uses as much as digits as its factorization.

131543989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 43.

The square root of 131543989 is about 11469.2627923507. The cubic root of 131543989 is about 508.5773358971.

The spelling of 131543989 in words is "one hundred thirty-one million, five hundred forty-three thousand, nine hundred eighty-nine".