9978613 has 2 divisors, whose sum is σ = 9978614.
Its totient is φ = 9978612.
The previous prime is 9978607. The next prime is 9978637. The reversal of 9978613 is 3168799.
It can be divided in two parts, 99786 and 13, that added together give a palindrome (99799).
9978613 is nontrivially palindromic in base 14.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 8191044 + 1787569 = 2862^2 + 1337^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-9978613 is a prime.
It is a self number, because there is not a number n which added to its sum of digits gives 9978613.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (9978653) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4989306 + 4989307.
It is an arithmetic number, because the mean of its divisors is an integer number (4989307).
Almost surely, 29978613 is an apocalyptic number.
9978613 is the 1689-th centered heptagonal number.
It is an amenable number.
9978613 is a deficient number, since it is larger than the sum of its proper divisors (1).
9978613 is an equidigital number, since it uses as much as digits as its factorization.
9978613 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 81648, while the sum is 43.
The square root of 9978613 is about 3158.8942685693.
The cubic root of 9978613 is about 215.2897697298.
The spelling of 9978613 in words is "nine million, nine hundred seventy-eight thousand, six hundred thirteen".