253955521 has 4 divisors (see below), whose sum is σ = 254245972. Its totient is φ = 253665072.

The previous prime is 253955519. The next prime is 253955551. The reversal of 253955521 is 125559352.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 78127921 + 175827600 = 8839^2 + 13260^2 .

It is a cyclic number.

It is not a de Polignac number, because 253955521 - 2¹ = 253955519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253955551) 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 in 3 ways as a sum of consecutive naturals, for example, 143910 + ... + 145663.

It is an arithmetic number, because the mean of its divisors is an integer number (63561493).

Almost surely, 2^253955521 is an apocalyptic number.

It is an amenable number.

253955521 is a deficient number, since it is larger than the sum of its proper divisors (290451).

253955521 is an equidigital number, since it uses as much as digits as its factorization.

253955521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290450.

The product of its digits is 67500, while the sum is 37.

The square root of 253955521 is about 15935.9819590761. The cubic root of 253955521 is about 633.2655842273.

The spelling of 253955521 in words is "two hundred fifty-three million, nine hundred fifty-five thousand, five hundred twenty-one".