117812881 has 2 divisors, whose sum is σ = 117812882. Its totient is φ = 117812880.

The previous prime is 117812869. The next prime is 117812909. The reversal of 117812881 is 188218711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76737600 + 41075281 = 8760^2 + 6409^2 .

It is a cyclic number.

It is not a de Polignac number, because 117812881 - 2⁷ = 117812753 is a prime.

It is a super-2 number, since 2×117812881² = 27759749859040322, which contains 22 as substring.

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 117812881.

It is not a weakly prime, because it can be changed into another prime (117812801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58906440 + 58906441.

It is an arithmetic number, because the mean of its divisors is an integer number (58906441).

Almost surely, 2^117812881 is an apocalyptic number.

It is an amenable number.

117812881 is a deficient number, since it is larger than the sum of its proper divisors (1).

117812881 is an equidigital number, since it uses as much as digits as its factorization.

117812881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7168, while the sum is 37.

The square root of 117812881 is about 10854.1642239281. The cubic root of 117812881 is about 490.2274121412.

The spelling of 117812881 in words is "one hundred seventeen million, eight hundred twelve thousand, eight hundred eighty-one".