117851971 has 2 divisors, whose sum is σ = 117851972. Its totient is φ = 117851970.

The previous prime is 117851959. The next prime is 117852013. The reversal of 117851971 is 179158711.

It is a weak prime.

It is an emirp because it is prime and its reverse (179158711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 117851971 - 2⁷ = 117851843 is a prime.

It is not a weakly prime, because it can be changed into another prime (117858971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58925985 + 58925986.

It is an arithmetic number, because the mean of its divisors is an integer number (58925986).

Almost surely, 2^117851971 is an apocalyptic number.

117851971 is a deficient number, since it is larger than the sum of its proper divisors (1).

117851971 is an equidigital number, since it uses as much as digits as its factorization.

117851971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 40.

The square root of 117851971 is about 10855.9647659708. The cubic root of 117851971 is about 490.2816248621.

The spelling of 117851971 in words is "one hundred seventeen million, eight hundred fifty-one thousand, nine hundred seventy-one".