125897521 has 2 divisors, whose sum is σ = 125897522. Its totient is φ = 125897520.

The previous prime is 125897503. The next prime is 125897533. The reversal of 125897521 is 125798521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120209296 + 5688225 = 10964^2 + 2385^2 .

It is a cyclic number.

It is not a de Polignac number, because 125897521 - 2¹⁹ = 125373233 is a prime.

It is not a weakly prime, because it can be changed into another prime (125894521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62948760 + 62948761.

It is an arithmetic number, because the mean of its divisors is an integer number (62948761).

Almost surely, 2^125897521 is an apocalyptic number.

It is an amenable number.

125897521 is a deficient number, since it is larger than the sum of its proper divisors (1).

125897521 is an equidigital number, since it uses as much as digits as its factorization.

125897521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 40.

The square root of 125897521 is about 11220.4064543135. The cubic root of 125897521 is about 501.1938418811.

The spelling of 125897521 in words is "one hundred twenty-five million, eight hundred ninety-seven thousand, five hundred twenty-one".