253005521 has 2 divisors, whose sum is σ = 253005522. Its totient is φ = 253005520.

The previous prime is 253005499. The next prime is 253005569. The reversal of 253005521 is 125500352.

253005521 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., 250873921 + 2131600 = 15839^2 + 1460^2 .

It is a cyclic number.

It is not a de Polignac number, because 253005521 - 2⁶ = 253005457 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (253005821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126502760 + 126502761.

It is an arithmetic number, because the mean of its divisors is an integer number (126502761).

Almost surely, 2^253005521 is an apocalyptic number.

It is an amenable number.

253005521 is a deficient number, since it is larger than the sum of its proper divisors (1).

253005521 is an equidigital number, since it uses as much as digits as its factorization.

253005521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 253005521 is about 15906.1472707881. The cubic root of 253005521 is about 632.4749549260.

Adding to 253005521 its reverse (125500352), we get a palindrome (378505873).

The spelling of 253005521 in words is "two hundred fifty-three million, five thousand, five hundred twenty-one".