217980913 has 8 divisors (see below), whose sum is σ = 227620800. Its totient is φ = 208354608.

The previous prime is 217980881. The next prime is 217980937. The reversal of 217980913 is 319089712.

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

It is not a de Polignac number, because 217980913 - 2⁵ = 217980881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217980013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43123 + ... + 47911.

It is an arithmetic number, because the mean of its divisors is an integer number (28452600).

Almost surely, 2^217980913 is an apocalyptic number.

217980913 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

217980913 is a deficient number, since it is larger than the sum of its proper divisors (9639887).

217980913 is a wasteful number, since it uses less digits than its factorization.

217980913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6791.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 217980913 is about 14764.1766787044. The cubic root of 217980913 is about 601.8286000784.

The spelling of 217980913 in words is "two hundred seventeen million, nine hundred eighty thousand, nine hundred thirteen".