128503013 has 2 divisors, whose sum is σ = 128503014. Its totient is φ = 128503012.

The previous prime is 128502977. The next prime is 128503019. The reversal of 128503013 is 310305821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111872929 + 16630084 = 10577^2 + 4078^2 .

It is a cyclic number.

It is not a de Polignac number, because 128503013 - 2¹⁸ = 128240869 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128503013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128503019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64251506 + 64251507.

It is an arithmetic number, because the mean of its divisors is an integer number (64251507).

Almost surely, 2^128503013 is an apocalyptic number.

It is an amenable number.

128503013 is a deficient number, since it is larger than the sum of its proper divisors (1).

128503013 is an equidigital number, since it uses as much as digits as its factorization.

128503013 is an odious number, because the sum of its binary digits is odd.

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

The square root of 128503013 is about 11335.9169457085. The cubic root of 128503013 is about 504.6277202685.

Adding to 128503013 its reverse (310305821), we get a palindrome (438808834).

The spelling of 128503013 in words is "one hundred twenty-eight million, five hundred three thousand, thirteen".