217061 has 8 divisors (see below), whose sum is σ = 238560. Its totient is φ = 196272.

The previous prime is 217057. The next prime is 217069. The reversal of 217061 is 160712.

217061 = T₁₁₆ + T₁₁₇ + ... + T₁₄₁.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 217061 - 2² = 217057 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 626 + ... + 908.

It is an arithmetic number, because the mean of its divisors is an integer number (29820).

2²¹⁷⁰⁶¹ is an apocalyptic number.

It is an amenable number.

217061 is a deficient number, since it is larger than the sum of its proper divisors (21499).

217061 is a wasteful number, since it uses less digits than its factorization.

217061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 217061 is about 465.8980575190. The cubic root of 217061 is about 60.0980803242.

Adding to 217061 its reverse (160712), we get a palindrome (377773).

The spelling of 217061 in words is "two hundred seventeen thousand, sixty-one".