30891377318779 has 2 divisors, whose sum is σ = 30891377318780. Its totient is φ = 30891377318778.

The previous prime is 30891377318707. The next prime is 30891377318843. The reversal of 30891377318779 is 97781377319803.

It is a strong prime.

It is an emirp because it is prime and its reverse (97781377319803) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30891377318779 - 2⁷ = 30891377318651 is a prime.

It is not a weakly prime, because it can be changed into another prime (30891377378779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15445688659389 + 15445688659390.

It is an arithmetic number, because the mean of its divisors is an integer number (15445688659390).

Almost surely, 2^{30891377318779} is an apocalyptic number.

30891377318779 is a deficient number, since it is larger than the sum of its proper divisors (1).

30891377318779 is an equidigital number, since it uses as much as digits as its factorization.

30891377318779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336063168, while the sum is 73.

The spelling of 30891377318779 in words is "thirty trillion, eight hundred ninety-one billion, three hundred seventy-seven million, three hundred eighteen thousand, seven hundred seventy-nine".