117881 has 2 divisors, whose sum is σ = 117882. Its totient is φ = 117880.

The previous prime is 117877. The next prime is 117883. The reversal of 117881 is 188711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116281 + 1600 = 341^2 + 40^2 .

It is an emirp because it is prime and its reverse (188711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 117881 - 2² = 117877 is a prime.

It is a super-2 number, since 2×117881² = 27791860322, which contains 22 as substring.

Together with 117883, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 117881.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 117881.

It is not a weakly prime, because it can be changed into another prime (117883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58940 + 58941.

It is an arithmetic number, because the mean of its divisors is an integer number (58941).

2¹¹⁷⁸⁸¹ is an apocalyptic number.

It is an amenable number.

117881 is a deficient number, since it is larger than the sum of its proper divisors (1).

117881 is an equidigital number, since it uses as much as digits as its factorization.

117881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 448, while the sum is 26.

The square root of 117881 is about 343.3380258579. The cubic root of 117881 is about 49.0321876535.

Subtracting from 117881 its sum of digits (26), we obtain a triangular number (117855 = T₄₈₅).

The spelling of 117881 in words is "one hundred seventeen thousand, eight hundred eighty-one".