2191445 has 8 divisors (see below), whose sum is σ = 2654520. Its totient is φ = 1736640.

The previous prime is 2191433. The next prime is 2191451. The reversal of 2191445 is 5441912.

It can be written as a sum of positive squares in 4 ways, for example, as 51076 + 2140369 = 226^2 + 1463^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2191445 - 2⁴ = 2191429 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1466 + ... + 2555.

It is an arithmetic number, because the mean of its divisors is an integer number (331815).

2^2191445 is an apocalyptic number.

It is an amenable number.

2191445 is a deficient number, since it is larger than the sum of its proper divisors (463075).

2191445 is a wasteful number, since it uses less digits than its factorization.

2191445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4135.

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

The square root of 2191445 is about 1480.3529984433. The cubic root of 2191445 is about 129.8903414511.

The spelling of 2191445 in words is "two million, one hundred ninety-one thousand, four hundred forty-five".