125413021 has 2 divisors, whose sum is σ = 125413022. Its totient is φ = 125413020.

The previous prime is 125413009. The next prime is 125413027. The reversal of 125413021 is 120314521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111619225 + 13793796 = 10565^2 + 3714^2 .

It is a cyclic number.

It is not a de Polignac number, because 125413021 - 2⁹ = 125412509 is a prime.

It is equal to p_7132321 and since 125413021 and 7132321 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 125413021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125413027) 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, 62706510 + 62706511.

It is an arithmetic number, because the mean of its divisors is an integer number (62706511).

Almost surely, 2^125413021 is an apocalyptic number.

It is an amenable number.

125413021 is a deficient number, since it is larger than the sum of its proper divisors (1).

125413021 is an equidigital number, since it uses as much as digits as its factorization.

125413021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 125413021 is about 11198.7955155901. The cubic root of 125413021 is about 500.5500892484.

Adding to 125413021 its reverse (120314521), we get a palindrome (245727542).

The spelling of 125413021 in words is "one hundred twenty-five million, four hundred thirteen thousand, twenty-one".