2191573 has 4 divisors (see below), whose sum is σ = 2245068. Its totient is φ = 2138080.

The previous prime is 2191561. The next prime is 2191583. The reversal of 2191573 is 3751912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 611524 + 1580049 = 782^2 + 1257^2 .

It is a cyclic number.

It is not a de Polignac number, because 2191573 - 2²¹ = 94421 is a prime.

It is a Duffinian number.

2191573 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26686 + ... + 26767.

It is an arithmetic number, because the mean of its divisors is an integer number (561267).

2^2191573 is an apocalyptic number.

It is an amenable number.

2191573 is a deficient number, since it is larger than the sum of its proper divisors (53495).

2191573 is an equidigital number, since it uses as much as digits as its factorization.

2191573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53494.

The product of its digits is 1890, while the sum is 28.

The square root of 2191573 is about 1480.3962307436. The cubic root of 2191573 is about 129.8928703213.

The spelling of 2191573 in words is "two million, one hundred ninety-one thousand, five hundred seventy-three".