2091889 has 2 divisors, whose sum is σ = 2091890. Its totient is φ = 2091888.

The previous prime is 2091877. The next prime is 2091913. The reversal of 2091889 is 9881902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1904400 + 187489 = 1380^2 + 433^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2091889 is a prime.

It is not a weakly prime, because it can be changed into another prime (2091809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1045944 + 1045945.

It is an arithmetic number, because the mean of its divisors is an integer number (1045945).

2^2091889 is an apocalyptic number.

It is an amenable number.

2091889 is a deficient number, since it is larger than the sum of its proper divisors (1).

2091889 is an equidigital number, since it uses as much as digits as its factorization.

2091889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 2091889 is about 1446.3364062347. The cubic root of 2091889 is about 127.8928342934.

The spelling of 2091889 in words is "two million, ninety-one thousand, eight hundred eighty-nine".