217055045 has 8 divisors (see below), whose sum is σ = 260643096. Its totient is φ = 173526016.

The previous prime is 217055039. The next prime is 217055089. The reversal of 217055045 is 540550712.

It can be written as a sum of positive squares in 4 ways, for example, as 38725729 + 178329316 = 6223^2 + 13354^2 .

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 217055045 - 2⁴ = 217055029 is a prime.

It is a super-2 number, since 2×217055045² = 94225785119904050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 217054999 and 217055017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6212 + ... + 21741.

It is an arithmetic number, because the mean of its divisors is an integer number (32580387).

Almost surely, 2^217055045 is an apocalyptic number.

It is an amenable number.

217055045 is a deficient number, since it is larger than the sum of its proper divisors (43588051).

217055045 is a wasteful number, since it uses less digits than its factorization.

217055045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29511.

The product of its (nonzero) digits is 7000, while the sum is 29.

The square root of 217055045 is about 14732.7880932293. The cubic root of 217055045 is about 600.9753072857.

The spelling of 217055045 in words is "two hundred seventeen million, fifty-five thousand, forty-five".