131285489 has 2 divisors, whose sum is σ = 131285490. Its totient is φ = 131285488.

The previous prime is 131285477. The next prime is 131285503. The reversal of 131285489 is 984582131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98704225 + 32581264 = 9935^2 + 5708^2 .

It is a cyclic number.

It is not a de Polignac number, because 131285489 - 2²⁰ = 130236913 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131285789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65642744 + 65642745.

It is an arithmetic number, because the mean of its divisors is an integer number (65642745).

Almost surely, 2^131285489 is an apocalyptic number.

It is an amenable number.

131285489 is a deficient number, since it is larger than the sum of its proper divisors (1).

131285489 is an equidigital number, since it uses as much as digits as its factorization.

131285489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 41.

The square root of 131285489 is about 11457.9879996446. The cubic root of 131285489 is about 508.2439785848.

The spelling of 131285489 in words is "one hundred thirty-one million, two hundred eighty-five thousand, four hundred eighty-nine".