217380013 has 4 divisors (see below), whose sum is σ = 221064480. Its totient is φ = 213695548.

The previous prime is 217379993. The next prime is 217380017. The reversal of 217380013 is 310083712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 217380013 - 2⁹ = 217379501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 217380013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217380017) 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 3 ways as a sum of consecutive naturals, for example, 1842145 + ... + 1842262.

It is an arithmetic number, because the mean of its divisors is an integer number (55266120).

Almost surely, 2^217380013 is an apocalyptic number.

It is an amenable number.

217380013 is a deficient number, since it is larger than the sum of its proper divisors (3684467).

217380013 is an equidigital number, since it uses as much as digits as its factorization.

217380013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3684466.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 217380013 is about 14743.8127022829. The cubic root of 217380013 is about 601.2750781880.

The spelling of 217380013 in words is "two hundred seventeen million, three hundred eighty thousand, thirteen".