125459813 has 6 divisors (see below), whose sum is σ = 133274226. Its totient is φ = 118079552.

The previous prime is 125459809. The next prime is 125459819. The reversal of 125459813 is 318954521.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 53260804 + 72199009 = 7298^2 + 8497^2 .

It is not a de Polignac number, because 125459813 - 2² = 125459809 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125459819) 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 in 5 ways as a sum of consecutive naturals, for example, 216770 + ... + 217347.

It is an arithmetic number, because the mean of its divisors is an integer number (22212371).

Almost surely, 2^125459813 is an apocalyptic number.

It is an amenable number.

125459813 is a deficient number, since it is larger than the sum of its proper divisors (7814413).

125459813 is an equidigital number, since it uses as much as digits as its factorization.

125459813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434151 (or 434134 counting only the distinct ones).

The product of its digits is 43200, while the sum is 38.

The square root of 125459813 is about 11200.8844740047. The cubic root of 125459813 is about 500.6123337885.

The spelling of 125459813 in words is "one hundred twenty-five million, four hundred fifty-nine thousand, eight hundred thirteen".