989128013 has 2 divisors, whose sum is σ = 989128014. Its totient is φ = 989128012.

The previous prime is 989128003. The next prime is 989128037. The reversal of 989128013 is 310821989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 680844649 + 308283364 = 26093^2 + 17558^2 .

It is an emirp because it is prime and its reverse (310821989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 989128013 - 2¹⁰ = 989126989 is a prime.

It is a super-2 number, since 2×989128013² = 1956748452202656338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989128003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494564006 + 494564007.

It is an arithmetic number, because the mean of its divisors is an integer number (494564007).

Almost surely, 2^989128013 is an apocalyptic number.

It is an amenable number.

989128013 is a deficient number, since it is larger than the sum of its proper divisors (1).

989128013 is an equidigital number, since it uses as much as digits as its factorization.

989128013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 989128013 is about 31450.4056094671. The cubic root of 989128013 is about 996.3627910839.

The spelling of 989128013 in words is "nine hundred eighty-nine million, one hundred twenty-eight thousand, thirteen".