2721565191 has 4 divisors (see below), whose sum is σ = 3628753592. Its totient is φ = 1814376792.

The previous prime is 2721565153. The next prime is 2721565201. The reversal of 2721565191 is 1915651272.

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

It is not a de Polignac number, because 2721565191 - 2¹⁵ = 2721532423 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 (2721565141) 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, 453594196 + ... + 453594201.

It is an arithmetic number, because the mean of its divisors is an integer number (907188398).

Almost surely, 2^2721565191 is an apocalyptic number.

2721565191 is a deficient number, since it is larger than the sum of its proper divisors (907188401).

2721565191 is an equidigital number, since it uses as much as digits as its factorization.

2721565191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907188400.

The product of its digits is 37800, while the sum is 39.

The square root of 2721565191 is about 52168.6226672700. The cubic root of 2721565191 is about 1396.1741105091.

It can be divided in two parts, 2721565 and 191, that multiplied together give a palindrome (519818915).

The spelling of 2721565191 in words is "two billion, seven hundred twenty-one million, five hundred sixty-five thousand, one hundred ninety-one".