253828721 has 2 divisors, whose sum is σ = 253828722. Its totient is φ = 253828720.

The previous prime is 253828709. The next prime is 253828753. The reversal of 253828721 is 127828352.

253828721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220938496 + 32890225 = 14864^2 + 5735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253828721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (253828781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126914360 + 126914361.

It is an arithmetic number, because the mean of its divisors is an integer number (126914361).

Almost surely, 2^253828721 is an apocalyptic number.

It is an amenable number.

253828721 is a deficient number, since it is larger than the sum of its proper divisors (1).

253828721 is an equidigital number, since it uses as much as digits as its factorization.

253828721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 38.

The square root of 253828721 is about 15932.0030441875. The cubic root of 253828721 is about 633.1601701719.

The spelling of 253828721 in words is "two hundred fifty-three million, eight hundred twenty-eight thousand, seven hundred twenty-one".