125212613 has 2 divisors, whose sum is σ = 125212614. Its totient is φ = 125212612.

The previous prime is 125212561. The next prime is 125212639. The reversal of 125212613 is 316212521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87291649 + 37920964 = 9343^2 + 6158^2 .

It is an emirp because it is prime and its reverse (316212521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125212613 - 2⁸ = 125212357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125212663) 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, 62606306 + 62606307.

It is an arithmetic number, because the mean of its divisors is an integer number (62606307).

Almost surely, 2^125212613 is an apocalyptic number.

It is an amenable number.

125212613 is a deficient number, since it is larger than the sum of its proper divisors (1).

125212613 is an equidigital number, since it uses as much as digits as its factorization.

125212613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 23.

The square root of 125212613 is about 11189.8441901574. The cubic root of 125212613 is about 500.2833234253.

The spelling of 125212613 in words is "one hundred twenty-five million, two hundred twelve thousand, six hundred thirteen".