1252335431521 has 2 divisors, whose sum is σ = 1252335431522. Its totient is φ = 1252335431520.

The previous prime is 1252335431507. The next prime is 1252335431531. The reversal of 1252335431521 is 1251345332521.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1230502118400 + 21833313121 = 1109280^2 + 147761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1252335431521 is a prime.

It is not a weakly prime, because it can be changed into another prime (1252335431531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626167715760 + 626167715761.

It is an arithmetic number, because the mean of its divisors is an integer number (626167715761).

Almost surely, 2^{1252335431521} is an apocalyptic number.

It is an amenable number.

1252335431521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1252335431521 is an equidigital number, since it uses as much as digits as its factorization.

1252335431521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108000, while the sum is 37.

The spelling of 1252335431521 in words is "one trillion, two hundred fifty-two billion, three hundred thirty-five million, four hundred thirty-one thousand, five hundred twenty-one".