131997889 has 4 divisors (see below), whose sum is σ = 132807856. Its totient is φ = 131187924.

The previous prime is 131997881. The next prime is 131997913. The reversal of 131997889 is 988799131.

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 131997889 - 2³ = 131997881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131997881) 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, 404739 + ... + 405064.

It is an arithmetic number, because the mean of its divisors is an integer number (33201964).

Almost surely, 2^131997889 is an apocalyptic number.

It is an amenable number.

131997889 is a deficient number, since it is larger than the sum of its proper divisors (809967).

131997889 is an equidigital number, since it uses as much as digits as its factorization.

131997889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809966.

The product of its digits is 979776, while the sum is 55.

The square root of 131997889 is about 11489.0334232258. The cubic root of 131997889 is about 509.1616226941.

The spelling of 131997889 in words is "one hundred thirty-one million, nine hundred ninety-seven thousand, eight hundred eighty-nine".