125563021 has 2 divisors, whose sum is σ = 125563022. Its totient is φ = 125563020.

The previous prime is 125562977. The next prime is 125563027. The reversal of 125563021 is 120365521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125216100 + 346921 = 11190^2 + 589^2 .

It is a cyclic number.

It is not a de Polignac number, because 125563021 - 2⁷ = 125562893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125563027) 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, 62781510 + 62781511.

It is an arithmetic number, because the mean of its divisors is an integer number (62781511).

Almost surely, 2^125563021 is an apocalyptic number.

It is an amenable number.

125563021 is a deficient number, since it is larger than the sum of its proper divisors (1).

125563021 is an equidigital number, since it uses as much as digits as its factorization.

125563021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 125563021 is about 11205.4906630634. The cubic root of 125563021 is about 500.7495703936.

The spelling of 125563021 in words is "one hundred twenty-five million, five hundred sixty-three thousand, twenty-one".