2640191 has 8 divisors (see below), whose sum is σ = 2726160. Its totient is φ = 2555712.

The previous prime is 2640181. The next prime is 2640217. The reversal of 2640191 is 1910462.

It is a happy number.

2640191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 2640191 - 2¹⁴ = 2623807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640181) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 4001 + ... + 4613.

It is an arithmetic number, because the mean of its divisors is an integer number (340770).

2^2640191 is an apocalyptic number.

2640191 is a deficient number, since it is larger than the sum of its proper divisors (85969).

2640191 is an equidigital number, since it uses as much as digits as its factorization.

2640191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 2640191 is about 1624.8664560511. The cubic root of 2640191 is about 138.2117975775.

The spelling of 2640191 in words is "two million, six hundred forty thousand, one hundred ninety-one".