117800161 has 2 divisors, whose sum is σ = 117800162. Its totient is φ = 117800160.

The previous prime is 117800159. The next prime is 117800197. The reversal of 117800161 is 161008711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81270225 + 36529936 = 9015^2 + 6044^2 .

It is a cyclic number.

It is not a de Polignac number, because 117800161 - 2¹ = 117800159 is a prime.

Together with 117800159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (117800101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58900080 + 58900081.

It is an arithmetic number, because the mean of its divisors is an integer number (58900081).

Almost surely, 2^117800161 is an apocalyptic number.

It is an amenable number.

117800161 is a deficient number, since it is larger than the sum of its proper divisors (1).

117800161 is an equidigital number, since it uses as much as digits as its factorization.

117800161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 25.

The square root of 117800161 is about 10853.5782578834. The cubic root of 117800161 is about 490.2097685778.

Adding to 117800161 its reverse (161008711), we get a palindrome (278808872).

The spelling of 117800161 in words is "one hundred seventeen million, eight hundred thousand, one hundred sixty-one".