125939521 has 2 divisors, whose sum is σ = 125939522. Its totient is φ = 125939520.

The previous prime is 125939503. The next prime is 125939533.

125939521 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110250000 + 15689521 = 10500^2 + 3961^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 125939521 - 2⁷ = 125939393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (125939551) 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, 62969760 + 62969761.

It is an arithmetic number, because the mean of its divisors is an integer number (62969761).

Almost surely, 2^125939521 is an apocalyptic number.

It is an amenable number.

125939521 is a deficient number, since it is larger than the sum of its proper divisors (1).

125939521 is an equidigital number, since it uses as much as digits as its factorization.

125939521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24300, while the sum is 37.

The square root of 125939521 is about 11222.2778882008. The cubic root of 125939521 is about 501.2495692187.

The spelling of 125939521 in words is "one hundred twenty-five million, nine hundred thirty-nine thousand, five hundred twenty-one".