2617842721 has 4 divisors (see below), whose sum is σ = 2819215252. Its totient is φ = 2416470192.

The previous prime is 2617842713. The next prime is 2617842737. The reversal of 2617842721 is 1272487162.

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 799758400 + 1818084321 = 28280^2 + 42639^2 .

It is a cyclic number.

It is not a de Polignac number, because 2617842721 - 2³ = 2617842713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2617842761) 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 3 ways as a sum of consecutive naturals, for example, 100686246 + ... + 100686271.

It is an arithmetic number, because the mean of its divisors is an integer number (704803813).

Almost surely, 2^2617842721 is an apocalyptic number.

It is an amenable number.

2617842721 is a deficient number, since it is larger than the sum of its proper divisors (201372531).

2617842721 is a wasteful number, since it uses less digits than its factorization.

2617842721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201372530.

The product of its digits is 75264, while the sum is 40.

The square root of 2617842721 is about 51164.8582622878. The cubic root of 2617842721 is about 1378.2072079350.

The spelling of 2617842721 in words is "two billion, six hundred seventeen million, eight hundred forty-two thousand, seven hundred twenty-one".