125504521 has 2 divisors, whose sum is σ = 125504522. Its totient is φ = 125504520.

The previous prime is 125504497. The next prime is 125504531. The reversal of 125504521 is 125405521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115670025 + 9834496 = 10755^2 + 3136^2 .

It is a cyclic number.

It is not a de Polignac number, because 125504521 - 2¹¹ = 125502473 is a prime.

It is not a weakly prime, because it can be changed into another prime (125504531) 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 as a sum of consecutive naturals, namely, 62752260 + 62752261.

It is an arithmetic number, because the mean of its divisors is an integer number (62752261).

Almost surely, 2^125504521 is an apocalyptic number.

It is an amenable number.

125504521 is a deficient number, since it is larger than the sum of its proper divisors (1).

125504521 is an equidigital number, since it uses as much as digits as its factorization.

125504521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 125504521 is about 11202.8800314919. The cubic root of 125504521 is about 500.6717916544.

It can be divided in two parts, 125504 and 521, that added together give a square (126025 = 355²).

The spelling of 125504521 in words is "one hundred twenty-five million, five hundred four thousand, five hundred twenty-one".