117210161 has 4 divisors (see below), whose sum is σ = 117316212. Its totient is φ = 117104112.

The previous prime is 117210157. The next prime is 117210209. The reversal of 117210161 is 161012711.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161012711 = 59 ⋅2729029.

It can be written as a sum of positive squares in 2 ways, for example, as 25816561 + 91393600 = 5081^2 + 9560^2 .

It is a cyclic number.

It is not a de Polignac number, because 117210161 - 2² = 117210157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (117210061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51350 + ... + 53583.

It is an arithmetic number, because the mean of its divisors is an integer number (29329053).

Almost surely, 2^117210161 is an apocalyptic number.

It is an amenable number.

117210161 is a deficient number, since it is larger than the sum of its proper divisors (106051).

117210161 is a wasteful number, since it uses less digits than its factorization.

117210161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106050.

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

The square root of 117210161 is about 10826.3641634669. The cubic root of 117210161 is about 489.3899961587.

Adding to 117210161 its reverse (161012711), we get a palindrome (278222872).

The spelling of 117210161 in words is "one hundred seventeen million, two hundred ten thousand, one hundred sixty-one".