2605340191 has 4 divisors (see below), whose sum is σ = 2605447000. Its totient is φ = 2605233384.

The previous prime is 2605340189. The next prime is 2605340209. The reversal of 2605340191 is 1910435062.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2605340191 - 2¹ = 2605340189 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 (2605340141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3145 + ... + 72253.

It is an arithmetic number, because the mean of its divisors is an integer number (651361750).

Almost surely, 2^2605340191 is an apocalyptic number.

2605340191 is a deficient number, since it is larger than the sum of its proper divisors (106809).

2605340191 is an equidigital number, since it uses as much as digits as its factorization.

2605340191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106808.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 2605340191 is about 51042.5331561826. The cubic root of 2605340191 is about 1376.0096502430.

The spelling of 2605340191 in words is "two billion, six hundred five million, three hundred forty thousand, one hundred ninety-one".