2291090 has 16 divisors (see below), whose sum is σ = 4366872. Its totient is φ = 862464.

The previous prime is 2291063. The next prime is 2291119. The reversal of 2291090 is 901922.

2291090 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2181529 + 109561 = 1477^2 + 331^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 6569 + ... + 6908.

2^2291090 is an apocalyptic number.

2291090 is a deficient number, since it is larger than the sum of its proper divisors (2075782).

2291090 is a wasteful number, since it uses less digits than its factorization.

2291090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13501.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 2291090 is about 1513.6346983338. The cubic root of 2291090 is about 131.8299386336.

The spelling of 2291090 in words is "two million, two hundred ninety-one thousand, ninety".