131687489 has 4 divisors (see below), whose sum is σ = 137413056. Its totient is φ = 125961924.

The previous prime is 131687483. The next prime is 131687497. The reversal of 131687489 is 984786131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131687489 - 2¹² = 131683393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131687483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2862749 + ... + 2862794.

It is an arithmetic number, because the mean of its divisors is an integer number (34353264).

Almost surely, 2^131687489 is an apocalyptic number.

It is an amenable number.

131687489 is a deficient number, since it is larger than the sum of its proper divisors (5725567).

131687489 is an equidigital number, since it uses as much as digits as its factorization.

131687489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5725566.

The product of its digits is 290304, while the sum is 47.

The square root of 131687489 is about 11475.5169382473. The cubic root of 131687489 is about 508.7622026384.

The spelling of 131687489 in words is "one hundred thirty-one million, six hundred eighty-seven thousand, four hundred eighty-nine".