128513837 has 2 divisors, whose sum is σ = 128513838. Its totient is φ = 128513836.

The previous prime is 128513831. The next prime is 128513851. The reversal of 128513837 is 738315821.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83704201 + 44809636 = 9149^2 + 6694^2 .

It is an emirp because it is prime and its reverse (738315821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128513837 - 2⁶ = 128513773 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128513837.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128513831) 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, 64256918 + 64256919.

It is an arithmetic number, because the mean of its divisors is an integer number (64256919).

Almost surely, 2^128513837 is an apocalyptic number.

It is an amenable number.

128513837 is a deficient number, since it is larger than the sum of its proper divisors (1).

128513837 is an equidigital number, since it uses as much as digits as its factorization.

128513837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 38.

The square root of 128513837 is about 11336.3943562316. The cubic root of 128513837 is about 504.6418883853.

The spelling of 128513837 in words is "one hundred twenty-eight million, five hundred thirteen thousand, eight hundred thirty-seven".