217943041 has 4 divisors (see below), whose sum is σ = 217998784. Its totient is φ = 217887300.

The previous prime is 217943039. The next prime is 217943071. The reversal of 217943041 is 140349712.

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 217943041 - 2¹ = 217943039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 217942994 and 217943012.

It is not an unprimeable number, because it can be changed into a prime (217943071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21525 + ... + 29986.

It is an arithmetic number, because the mean of its divisors is an integer number (54499696).

Almost surely, 2^217943041 is an apocalyptic number.

It is an amenable number.

217943041 is a deficient number, since it is larger than the sum of its proper divisors (55743).

217943041 is an equidigital number, since it uses as much as digits as its factorization.

217943041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55742.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 217943041 is about 14762.8940590929. The cubic root of 217943041 is about 601.7937441629.

The spelling of 217943041 in words is "two hundred seventeen million, nine hundred forty-three thousand, forty-one".