2191544 has 8 divisors (see below), whose sum is σ = 4109160. Its totient is φ = 1095768.

The previous prime is 2191537. The next prime is 2191549. The reversal of 2191544 is 4451912.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 136964 + ... + 136979.

It is an arithmetic number, because the mean of its divisors is an integer number (513645).

2^2191544 is an apocalyptic number.

It is an amenable number.

2191544 is a deficient number, since it is larger than the sum of its proper divisors (1917616).

2191544 is a wasteful number, since it uses less digits than its factorization.

2191544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273949 (or 273945 counting only the distinct ones).

The product of its digits is 1440, while the sum is 26.

The square root of 2191544 is about 1480.3864360362. The cubic root of 2191544 is about 129.8922973828.

The spelling of 2191544 in words is "two million, one hundred ninety-one thousand, five hundred forty-four".