308611386893 has 2 divisors, whose sum is σ = 308611386894. Its totient is φ = 308611386892.

The previous prime is 308611386859. The next prime is 308611386913. The reversal of 308611386893 is 398683116803.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220465933444 + 88145453449 = 469538^2 + 296893^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-308611386893 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (308611386823) 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, 154305693446 + 154305693447.

It is an arithmetic number, because the mean of its divisors is an integer number (154305693447).

Almost surely, 2^308611386893 is an apocalyptic number.

It is an amenable number.

308611386893 is a deficient number, since it is larger than the sum of its proper divisors (1).

308611386893 is an equidigital number, since it uses as much as digits as its factorization.

308611386893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4478976, while the sum is 56.

The spelling of 308611386893 in words is "three hundred eight billion, six hundred eleven million, three hundred eighty-six thousand, eight hundred ninety-three".