2922721 has 2 divisors, whose sum is σ = 2922722. Its totient is φ = 2922720.

The previous prime is 2922709. The next prime is 2922737. The reversal of 2922721 is 1272292.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2217121 + 705600 = 1489^2 + 840^2 .

It is a cyclic number.

It is not a de Polignac number, because 2922721 - 2⁹ = 2922209 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 2⁴ + 9³ + 2⁸ + 2¹⁰ + 7⁷ + 2²¹ + 1 .

It is not a weakly prime, because it can be changed into another prime (2922761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1461360 + 1461361.

It is an arithmetic number, because the mean of its divisors is an integer number (1461361).

2^2922721 is an apocalyptic number.

It is an amenable number.

2922721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2922721 is an equidigital number, since it uses as much as digits as its factorization.

2922721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 25.

The square root of 2922721 is about 1709.5967360755. The cubic root of 2922721 is about 142.9757730323.

The spelling of 2922721 in words is "two million, nine hundred twenty-two thousand, seven hundred twenty-one".