2131889 has 4 divisors (see below), whose sum is σ = 2166900. Its totient is φ = 2096880.

The previous prime is 2131867. The next prime is 2131907. The reversal of 2131889 is 9881312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 78400 + 2053489 = 280^2 + 1433^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2131889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2131849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17414 + ... + 17535.

It is an arithmetic number, because the mean of its divisors is an integer number (541725).

2^2131889 is an apocalyptic number.

It is an amenable number.

2131889 is a deficient number, since it is larger than the sum of its proper divisors (35011).

2131889 is an equidigital number, since it uses as much as digits as its factorization.

2131889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35010.

The product of its digits is 3456, while the sum is 32.

The square root of 2131889 is about 1460.0989692483. The cubic root of 2131889 is about 128.7028595448.

The spelling of 2131889 in words is "two million, one hundred thirty-one thousand, eight hundred eighty-nine".