7857109811 has 2 divisors, whose sum is σ = 7857109812. Its totient is φ = 7857109810.

The previous prime is 7857109807. The next prime is 7857109817. The reversal of 7857109811 is 1189017587.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7857109811 - 2² = 7857109807 is a prime.

It is a super-2 number, since 2×7857109811² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (7857109817) 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, 3928554905 + 3928554906.

It is an arithmetic number, because the mean of its divisors is an integer number (3928554906).

Almost surely, 2^7857109811 is an apocalyptic number.

7857109811 is a deficient number, since it is larger than the sum of its proper divisors (1).

7857109811 is an equidigital number, since it uses as much as digits as its factorization.

7857109811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141120, while the sum is 47.

The square root of 7857109811 is about 88640.3396372103. The cubic root of 7857109811 is about 1988.0208778156.

The spelling of 7857109811 in words is "seven billion, eight hundred fifty-seven million, one hundred nine thousand, eight hundred eleven".