2191065 has 24 divisors (see below), whose sum is σ = 3634560. Its totient is φ = 1126944.

The previous prime is 2191051. The next prime is 2191067. The reversal of 2191065 is 5601912.

It is not a de Polignac number, because 2191065 - 2⁶ = 2191001 is a prime.

2191065 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191067) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27696 + ... + 27774.

It is an arithmetic number, because the mean of its divisors is an integer number (151440).

2^2191065 is an apocalyptic number.

It is an amenable number.

2191065 is a deficient number, since it is larger than the sum of its proper divisors (1443495).

2191065 is an equidigital number, since it uses as much as digits as its factorization.

2191065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 2191065 is about 1480.2246451130. The cubic root of 2191065 is about 129.8828332874.

Adding to 2191065 its reverse (5601912), we get a palindrome (7792977).

The spelling of 2191065 in words is "two million, one hundred ninety-one thousand, sixty-five".