125312505203521 has 2 divisors, whose sum is σ = 125312505203522. Its totient is φ = 125312505203520.

The previous prime is 125312505203507. The next prime is 125312505203527. The reversal of 125312505203521 is 125302505213521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114217077443121 + 11095427760400 = 10687239^2 + 3330980^2 .

It is a cyclic number.

It is not a de Polignac number, because 125312505203521 - 2⁵ = 125312505203489 is a prime.

It is not a weakly prime, because it can be changed into another prime (125312505203527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62656252601760 + 62656252601761.

It is an arithmetic number, because the mean of its divisors is an integer number (62656252601761).

Almost surely, 2^{125312505203521} is an apocalyptic number.

It is an amenable number.

125312505203521 is a deficient number, since it is larger than the sum of its proper divisors (1).

125312505203521 is an equidigital number, since it uses as much as digits as its factorization.

125312505203521 is an evil number, because the sum of its binary digits is even.

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

The spelling of 125312505203521 in words is "one hundred twenty-five trillion, three hundred twelve billion, five hundred five million, two hundred three thousand, five hundred twenty-one".