117898181 has 2 divisors, whose sum is σ = 117898182. Its totient is φ = 117898180.

The previous prime is 117898153. The next prime is 117898189. The reversal of 117898181 is 181898711.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100600900 + 17297281 = 10030^2 + 4159^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117898181 is a prime.

It is a super-2 number, since 2×117898181² = 27799962166217522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117898189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58949090 + 58949091.

It is an arithmetic number, because the mean of its divisors is an integer number (58949091).

Almost surely, 2^117898181 is an apocalyptic number.

It is an amenable number.

117898181 is a deficient number, since it is larger than the sum of its proper divisors (1).

117898181 is an equidigital number, since it uses as much as digits as its factorization.

117898181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 44.

The square root of 117898181 is about 10858.0928804279. The cubic root of 117898181 is about 490.3456966328.

The spelling of 117898181 in words is "one hundred seventeen million, eight hundred ninety-eight thousand, one hundred eighty-one".