2291989 has 12 divisors (see below), whose sum is σ = 2767584. Its totient is φ = 1859112.

The previous prime is 2291987. The next prime is 2291999. The reversal of 2291989 is 9891922.

2291989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2291989 - 2¹ = 2291987 is a prime.

It is a super-2 number, since 2×2291989² = 10506427152242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2291983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2074 + ... + 2980.

It is an arithmetic number, because the mean of its divisors is an integer number (230632).

2^2291989 is an apocalyptic number.

It is an amenable number.

2291989 is a deficient number, since it is larger than the sum of its proper divisors (475595).

2291989 is an equidigital number, since it uses as much as digits as its factorization.

2291989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952 (or 933 counting only the distinct ones).

The product of its digits is 23328, while the sum is 40.

The square root of 2291989 is about 1513.9316365015. The cubic root of 2291989 is about 131.8471792799.

The spelling of 2291989 in words is "two million, two hundred ninety-one thousand, nine hundred eighty-nine".