308614691921 has 2 divisors, whose sum is σ = 308614691922. Its totient is φ = 308614691920.

The previous prime is 308614691881. The next prime is 308614691923. The reversal of 308614691921 is 129196416803.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184869041296 + 123745650625 = 429964^2 + 351775^2 .

It is a cyclic number.

It is not a de Polignac number, because 308614691921 - 2³⁴ = 291434822737 is a prime.

Together with 308614691923, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 308614691921.

It is not a weakly prime, because it can be changed into another prime (308614691923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154307345960 + 154307345961.

It is an arithmetic number, because the mean of its divisors is an integer number (154307345961).

Almost surely, 2^308614691921 is an apocalyptic number.

It is an amenable number.

308614691921 is a deficient number, since it is larger than the sum of its proper divisors (1).

308614691921 is an equidigital number, since it uses as much as digits as its factorization.

308614691921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 50.

The spelling of 308614691921 in words is "three hundred eight billion, six hundred fourteen million, six hundred ninety-one thousand, nine hundred twenty-one".