2191489 has 2 divisors, whose sum is σ = 2191490. Its totient is φ = 2191488.

The previous prime is 2191477. The next prime is 2191493. The reversal of 2191489 is 9841912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2190400 + 1089 = 1480^2 + 33^2 .

It is a cyclic number.

It is not a de Polignac number, because 2191489 - 2⁵ = 2191457 is a prime.

It is not a weakly prime, because it can be changed into another prime (2191429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095744 + 1095745.

It is an arithmetic number, because the mean of its divisors is an integer number (1095745).

2^2191489 is an apocalyptic number.

It is an amenable number.

2191489 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191489 is an equidigital number, since it uses as much as digits as its factorization.

2191489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 34.

The square root of 2191489 is about 1480.3678596889. The cubic root of 2191489 is about 129.8912107613.

The spelling of 2191489 in words is "two million, one hundred ninety-one thousand, four hundred eighty-nine".