30978118613 has 12 divisors (see below), whose sum is σ = 34450964388. Its totient is φ = 27822337920.

The previous prime is 30978118603. The next prime is 30978118621. The reversal of 30978118613 is 31681187903.

It can be written as a sum of positive squares in 6 ways, for example, as 2184440644 + 28793677969 = 46738^2 + 169687^2 .

It is a de Polignac number, because none of the positive numbers 2^k-30978118613 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 (30978118603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2470808 + ... + 2483313.

It is an arithmetic number, because the mean of its divisors is an integer number (2870913699).

Almost surely, 2^30978118613 is an apocalyptic number.

It is an amenable number.

30978118613 is a deficient number, since it is larger than the sum of its proper divisors (3472845775).

30978118613 is a wasteful number, since it uses less digits than its factorization.

30978118613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4954184 (or 4954171 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 47.

The spelling of 30978118613 in words is "thirty billion, nine hundred seventy-eight million, one hundred eighteen thousand, six hundred thirteen".