2717921 has 2 divisors, whose sum is σ = 2717922. Its totient is φ = 2717920.

The previous prime is 2717903. The next prime is 2717929. The reversal of 2717921 is 1297172.

2717921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1638400 + 1079521 = 1280^2 + 1039^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2717921 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2717929) 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 as a sum of consecutive naturals, namely, 1358960 + 1358961.

It is an arithmetic number, because the mean of its divisors is an integer number (1358961).

2^2717921 is an apocalyptic number.

It is an amenable number.

2717921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2717921 is an equidigital number, since it uses as much as digits as its factorization.

2717921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1764, while the sum is 29.

The square root of 2717921 is about 1648.6118403069. The cubic root of 2717921 is about 139.5550670518. Note that the first 3 decimals are identical.

It can be divided in two parts, 271 and 7921, that added together give a 13-th power (8192 = 2¹³).

The spelling of 2717921 in words is "two million, seven hundred seventeen thousand, nine hundred twenty-one".