2721691705 has 4 divisors (see below), whose sum is σ = 3266030052. Its totient is φ = 2177353360.

The previous prime is 2721691703. The next prime is 2721691711. The reversal of 2721691705 is 5071961272.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2148137104 + 573554601 = 46348^2 + 23949^2 .

It is not a de Polignac number, because 2721691705 - 2¹ = 2721691703 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2721691703) 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, 272169166 + ... + 272169175.

It is an arithmetic number, because the mean of its divisors is an integer number (816507513).

Almost surely, 2^2721691705 is an apocalyptic number.

It is an amenable number.

2721691705 is a deficient number, since it is larger than the sum of its proper divisors (544338347).

2721691705 is an equidigital number, since it uses as much as digits as its factorization.

2721691705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544338346.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 2721691705 is about 52169.8352019632. The cubic root of 2721691705 is about 1396.1957442409.

The spelling of 2721691705 in words is "two billion, seven hundred twenty-one million, six hundred ninety-one thousand, seven hundred five".