1253530415521 has 2 divisors, whose sum is σ = 1253530415522. Its totient is φ = 1253530415520.

The previous prime is 1253530415483. The next prime is 1253530415531. The reversal of 1253530415521 is 1255140353521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 941986713600 + 311543701921 = 970560^2 + 558161^2 .

It is a cyclic number.

It is not a de Polignac number, because 1253530415521 - 2¹³ = 1253530407329 is a prime.

It is not a weakly prime, because it can be changed into another prime (1253530415531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626765207760 + 626765207761.

It is an arithmetic number, because the mean of its divisors is an integer number (626765207761).

Almost surely, 2^{1253530415521} is an apocalyptic number.

It is an amenable number.

1253530415521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1253530415521 is an equidigital number, since it uses as much as digits as its factorization.

1253530415521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90000, while the sum is 37.

The spelling of 1253530415521 in words is "one trillion, two hundred fifty-three billion, five hundred thirty million, four hundred fifteen thousand, five hundred twenty-one".