2191304 has 8 divisors (see below), whose sum is σ = 4108710. Its totient is φ = 1095648.

The previous prime is 2191291. The next prime is 2191331. The reversal of 2191304 is 4031912.

2191304 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 only one way, i.e., 2102500 + 88804 = 1450^2 + 298^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a d-powerful number, because it can be written as 2 + 1 + 9⁶ + 1 + 3¹³ + 0 + 4⁸ .

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 as a sum of consecutive naturals, namely, 136949 + ... + 136964.

2^2191304 is an apocalyptic number.

It is an amenable number.

2191304 is a deficient number, since it is larger than the sum of its proper divisors (1917406).

2191304 is a wasteful number, since it uses less digits than its factorization.

2191304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273919 (or 273915 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 2191304 is about 1480.3053739009. The cubic root of 2191304 is about 129.8875556285.

The spelling of 2191304 in words is "two million, one hundred ninety-one thousand, three hundred four".