131278489 has 2 divisors, whose sum is σ = 131278490. Its totient is φ = 131278488.

The previous prime is 131278453. The next prime is 131278501. The reversal of 131278489 is 984872131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72250000 + 59028489 = 8500^2 + 7683^2 .

It is a cyclic number.

It is not a de Polignac number, because 131278489 - 2¹¹ = 131276441 is a prime.

It is equal to p_7446598 and since 131278489 and 7446598 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (131278409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65639244 + 65639245.

It is an arithmetic number, because the mean of its divisors is an integer number (65639245).

Almost surely, 2^131278489 is an apocalyptic number.

It is an amenable number.

131278489 is a deficient number, since it is larger than the sum of its proper divisors (1).

131278489 is an equidigital number, since it uses as much as digits as its factorization.

131278489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 43.

The square root of 131278489 is about 11457.6825318212. The cubic root of 131278489 is about 508.2349454182.

The spelling of 131278489 in words is "one hundred thirty-one million, two hundred seventy-eight thousand, four hundred eighty-nine".