30913166621 has 2 divisors, whose sum is σ = 30913166622. Its totient is φ = 30913166620.

The previous prime is 30913166587. The next prime is 30913166651. The reversal of 30913166621 is 12666131903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22857206596 + 8055960025 = 151186^2 + 89755^2 .

It is an emirp because it is prime and its reverse (12666131903) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30913166621 - 2¹⁰ = 30913165597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30913166651) 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 as a sum of consecutive naturals, namely, 15456583310 + 15456583311.

It is an arithmetic number, because the mean of its divisors is an integer number (15456583311).

Almost surely, 2^30913166621 is an apocalyptic number.

It is an amenable number.

30913166621 is a deficient number, since it is larger than the sum of its proper divisors (1).

30913166621 is an equidigital number, since it uses as much as digits as its factorization.

30913166621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 38.

The spelling of 30913166621 in words is "thirty billion, nine hundred thirteen million, one hundred sixty-six thousand, six hundred twenty-one".