3108778681 has 2 divisors, whose sum is σ = 3108778682. Its totient is φ = 3108778680.

The previous prime is 3108778649. The next prime is 3108778723. The reversal of 3108778681 is 1868778013.

3108778681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1712635456 + 1396143225 = 41384^2 + 37365^2 .

It is a cyclic number.

It is not a de Polignac number, because 3108778681 - 2⁵ = 3108778649 is a prime.

It is a super-2 number, since 2×3108778681² = 19329009774880199522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3108778781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1554389340 + 1554389341.

It is an arithmetic number, because the mean of its divisors is an integer number (1554389341).

Almost surely, 2^3108778681 is an apocalyptic number.

It is an amenable number.

3108778681 is a deficient number, since it is larger than the sum of its proper divisors (1).

3108778681 is an equidigital number, since it uses as much as digits as its factorization.

3108778681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 451584, while the sum is 49.

The square root of 3108778681 is about 55756.4227780083. The cubic root of 3108778681 is about 1459.4748034345.

The spelling of 3108778681 in words is "three billion, one hundred eight million, seven hundred seventy-eight thousand, six hundred eighty-one".