210117161 has 6 divisors (see below), whose sum is σ = 223204350. Its totient is φ = 197757056.

The previous prime is 210117139. The next prime is 210117179. The reversal of 210117161 is 161711012.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 26677225 + 183439936 = 5165^2 + 13544^2 .

It is not a de Polignac number, because 210117161 - 2¹⁴ = 210100777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210117361) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 363236 + ... + 363813.

It is an arithmetic number, because the mean of its divisors is an integer number (37200725).

Almost surely, 2^210117161 is an apocalyptic number.

It is an amenable number.

210117161 is a deficient number, since it is larger than the sum of its proper divisors (13087189).

210117161 is an equidigital number, since it uses as much as digits as its factorization.

210117161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727083 (or 727066 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 20.

The square root of 210117161 is about 14495.4186210678. The cubic root of 210117161 is about 594.5027137480.

Adding to 210117161 its reverse (161711012), we get a palindrome (371828173).

The spelling of 210117161 in words is "two hundred ten million, one hundred seventeen thousand, one hundred sixty-one".