3868170781 has 2 divisors, whose sum is σ = 3868170782. Its totient is φ = 3868170780.

The previous prime is 3868170643. The next prime is 3868170799. The reversal of 3868170781 is 1870718683.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3037001881 + 831168900 = 55109^2 + 28830^2 .

It is an emirp because it is prime and its reverse (1870718683) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3868170781 - 2¹⁹ = 3867646493 is a prime.

It is a super-2 number, since 2×3868170781² = 29925490381964299922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3868170181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1934085390 + 1934085391.

It is an arithmetic number, because the mean of its divisors is an integer number (1934085391).

Almost surely, 2^3868170781 is an apocalyptic number.

It is an amenable number.

3868170781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3868170781 is an equidigital number, since it uses as much as digits as its factorization.

3868170781 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 3868170781 is about 62194.6201933897. The cubic root of 3868170781 is about 1569.7670663390.

The spelling of 3868170781 in words is "three billion, eight hundred sixty-eight million, one hundred seventy thousand, seven hundred eighty-one".