117866851 has 2 divisors, whose sum is σ = 117866852. Its totient is φ = 117866850.

The previous prime is 117866849. The next prime is 117866891. The reversal of 117866851 is 158668711.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 117866851 - 2¹ = 117866849 is a prime.

Together with 117866849, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 117866798 and 117866807.

It is not a weakly prime, because it can be changed into another prime (117866891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58933425 + 58933426.

It is an arithmetic number, because the mean of its divisors is an integer number (58933426).

Almost surely, 2^117866851 is an apocalyptic number.

117866851 is a deficient number, since it is larger than the sum of its proper divisors (1).

117866851 is an equidigital number, since it uses as much as digits as its factorization.

117866851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 43.

The square root of 117866851 is about 10856.6500818623. The cubic root of 117866851 is about 490.3022583271.

The spelling of 117866851 in words is "one hundred seventeen million, eight hundred sixty-six thousand, eight hundred fifty-one".