131644489 has 2 divisors, whose sum is σ = 131644490. Its totient is φ = 131644488.

The previous prime is 131644459. The next prime is 131644493. The reversal of 131644489 is 984446131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75394489 + 56250000 = 8683^2 + 7500^2 .

It is an emirp because it is prime and its reverse (984446131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131644489 - 2⁷ = 131644361 is a prime.

It is a super-6 number, since 6×131644489⁶ (a number of 50 digits) contains 666666 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (131644459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65822244 + 65822245.

It is an arithmetic number, because the mean of its divisors is an integer number (65822245).

Almost surely, 2^131644489 is an apocalyptic number.

It is an amenable number.

131644489 is a deficient number, since it is larger than the sum of its proper divisors (1).

131644489 is an equidigital number, since it uses as much as digits as its factorization.

131644489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 40.

The square root of 131644489 is about 11473.6432313368. The cubic root of 131644489 is about 508.7068211276.

The spelling of 131644489 in words is "one hundred thirty-one million, six hundred forty-four thousand, four hundred eighty-nine".