131888989 has 4 divisors (see below), whose sum is σ = 132774300. Its totient is φ = 131003680.

The previous prime is 131888959. The next prime is 131888993. The reversal of 131888989 is 989888131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 989888131 = 2143 ⋅461917.

It can be written as a sum of positive squares in 2 ways, for example, as 11108889 + 120780100 = 3333^2 + 10990^2 .

It is a cyclic number.

It is not a de Polignac number, because 131888989 - 2⁵ = 131888957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131888959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 442432 + ... + 442729.

It is an arithmetic number, because the mean of its divisors is an integer number (33193575).

Almost surely, 2^131888989 is an apocalyptic number.

It is an amenable number.

131888989 is a deficient number, since it is larger than the sum of its proper divisors (885311).

131888989 is an equidigital number, since it uses as much as digits as its factorization.

131888989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885310.

The product of its digits is 995328, while the sum is 55.

The square root of 131888989 is about 11484.2931432457. The cubic root of 131888989 is about 509.0215624844.

The spelling of 131888989 in words is "one hundred thirty-one million, eight hundred eighty-eight thousand, nine hundred eighty-nine".