253430321 has 2 divisors, whose sum is σ = 253430322. Its totient is φ = 253430320.

The previous prime is 253430297. The next prime is 253430323. The reversal of 253430321 is 123034352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 253159921 + 270400 = 15911^2 + 520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253430321 is a prime.

Together with 253430323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (253430323) 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, 126715160 + 126715161.

It is an arithmetic number, because the mean of its divisors is an integer number (126715161).

Almost surely, 2^253430321 is an apocalyptic number.

It is an amenable number.

253430321 is a deficient number, since it is larger than the sum of its proper divisors (1).

253430321 is an equidigital number, since it uses as much as digits as its factorization.

253430321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 253430321 is about 15919.4949982718. The cubic root of 253430321 is about 632.8287352571.

Adding to 253430321 its reverse (123034352), we get a palindrome (376464673).

The spelling of 253430321 in words is "two hundred fifty-three million, four hundred thirty thousand, three hundred twenty-one".