30813928181 has 2 divisors, whose sum is σ = 30813928182. Its totient is φ = 30813928180.

The previous prime is 30813928169. The next prime is 30813928199. The reversal of 30813928181 is 18182931803.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30029424100 + 784504081 = 173290^2 + 28009^2 .

It is an emirp because it is prime and its reverse (18182931803) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30813928181 is a prime.

It is a super-2 number, since 2×30813928181² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30813921181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15406964090 + 15406964091.

It is an arithmetic number, because the mean of its divisors is an integer number (15406964091).

Almost surely, 2^30813928181 is an apocalyptic number.

It is an amenable number.

30813928181 is a deficient number, since it is larger than the sum of its proper divisors (1).

30813928181 is an equidigital number, since it uses as much as digits as its factorization.

30813928181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 44.

The spelling of 30813928181 in words is "thirty billion, eight hundred thirteen million, nine hundred twenty-eight thousand, one hundred eighty-one".