253275521 has 2 divisors, whose sum is σ = 253275522. Its totient is φ = 253275520.

The previous prime is 253275511. The next prime is 253275523. The reversal of 253275521 is 125572352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 253159921 + 115600 = 15911^2 + 340^2 .

It is a cyclic number.

It is not a de Polignac number, because 253275521 - 2²⁶ = 186166657 is a prime.

It is a Sophie Germain prime.

Together with 253275523, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (253275523) 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, 126637760 + 126637761.

It is an arithmetic number, because the mean of its divisors is an integer number (126637761).

Almost surely, 2^253275521 is an apocalyptic number.

It is an amenable number.

253275521 is a deficient number, since it is larger than the sum of its proper divisors (1).

253275521 is an equidigital number, since it uses as much as digits as its factorization.

253275521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21000, while the sum is 32.

The square root of 253275521 is about 15914.6322923277. The cubic root of 253275521 is about 632.6998611215.

The spelling of 253275521 in words is "two hundred fifty-three million, two hundred seventy-five thousand, five hundred twenty-one".