125321013 has 10 divisors (see below), whose sum is σ = 187208054. Its totient is φ = 83547288.

The previous prime is 125320999. The next prime is 125321029. The reversal of 125321013 is 310123521.

It can be written as a sum of positive squares in only one way, i.e., 81324324 + 43996689 = 9018^2 + 6633^2 .

It is not a de Polignac number, because 125321013 - 2⁹ = 125320501 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125321033) 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 9 ways as a sum of consecutive naturals, for example, 773506 + ... + 773667.

Almost surely, 2^125321013 is an apocalyptic number.

It is an amenable number.

125321013 is a deficient number, since it is larger than the sum of its proper divisors (61887041).

125321013 is an equidigital number, since it uses as much as digits as its factorization.

125321013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1547185 (or 1547176 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 125321013 is about 11194.6868200946. The cubic root of 125321013 is about 500.4276514575.

Adding to 125321013 its reverse (310123521), we get a palindrome (435444534).

The spelling of 125321013 in words is "one hundred twenty-five million, three hundred twenty-one thousand, thirteen".