253887521 has 2 divisors, whose sum is σ = 253887522. Its totient is φ = 253887520.

The previous prime is 253887511. The next prime is 253887533. The reversal of 253887521 is 125788352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216237025 + 37650496 = 14705^2 + 6136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253887521 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (253887511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126943760 + 126943761.

It is an arithmetic number, because the mean of its divisors is an integer number (126943761).

Almost surely, 2^253887521 is an apocalyptic number.

It is an amenable number.

253887521 is a deficient number, since it is larger than the sum of its proper divisors (1).

253887521 is an equidigital number, since it uses as much as digits as its factorization.

253887521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 134400, while the sum is 41.

The square root of 253887521 is about 15933.8482796844. The cubic root of 253887521 is about 633.2090573945.

The spelling of 253887521 in words is "two hundred fifty-three million, eight hundred eighty-seven thousand, five hundred twenty-one".