217349913 has 16 divisors (see below), whose sum is σ = 334742976. Its totient is φ = 123978240.

The previous prime is 217349887. The next prime is 217349917. The reversal of 217349913 is 319943712.

It is not a de Polignac number, because 217349913 - 2¹⁰ = 217348889 is a prime.

It is a super-2 number, since 2×217349913² = 94481969362215138, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (217349917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193156 + ... + 194277.

It is an arithmetic number, because the mean of its divisors is an integer number (20921436).

Almost surely, 2^217349913 is an apocalyptic number.

It is an amenable number.

217349913 is a deficient number, since it is larger than the sum of its proper divisors (117393063).

217349913 is a wasteful number, since it uses less digits than its factorization.

217349913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387464.

The product of its digits is 40824, while the sum is 39.

The square root of 217349913 is about 14742.7918997726. The cubic root of 217349913 is about 601.2473246164.

The spelling of 217349913 in words is "two hundred seventeen million, three hundred forty-nine thousand, nine hundred thirteen".