217130557 has 8 divisors (see below), whose sum is σ = 258938496. Its totient is φ = 178019952.

The previous prime is 217130531. The next prime is 217130581. The reversal of 217130557 is 755031712.

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 217130557 - 2⁷ = 217130429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217130587) 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, 674158 + ... + 674479.

It is an arithmetic number, because the mean of its divisors is an integer number (32367312).

Almost surely, 2^217130557 is an apocalyptic number.

It is an amenable number.

217130557 is a deficient number, since it is larger than the sum of its proper divisors (41807939).

217130557 is a wasteful number, since it uses less digits than its factorization.

217130557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348667.

The product of its (nonzero) digits is 7350, while the sum is 31.

The square root of 217130557 is about 14735.3505896534. The cubic root of 217130557 is about 601.0449909702.

The spelling of 217130557 in words is "two hundred seventeen million, one hundred thirty thousand, five hundred fifty-seven".