4050721 has 2 divisors, whose sum is σ = 4050722. Its totient is φ = 4050720.

The previous prime is 4050719. The next prime is 4050727. The reversal of 4050721 is 1270504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3920400 + 130321 = 1980^2 + 361^2 .

It is a cyclic number.

It is not a de Polignac number, because 4050721 - 2¹ = 4050719 is a prime.

Together with 4050719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (4050727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2025360 + 2025361.

It is an arithmetic number, because the mean of its divisors is an integer number (2025361).

Almost surely, 2^4050721 is an apocalyptic number.

It is an amenable number.

4050721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4050721 is an equidigital number, since it uses as much as digits as its factorization.

4050721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 4050721 is about 2012.6403056682. The cubic root of 4050721 is about 159.4082437893.

The spelling of 4050721 in words is "four million, fifty thousand, seven hundred twenty-one".