217943039 has 2 divisors, whose sum is σ = 217943040. Its totient is φ = 217943038.

The previous prime is 217942999. The next prime is 217943071. The reversal of 217943039 is 930349712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 217943039 - 2¹² = 217938943 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 217942993 and 217943011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217943639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108971519 + 108971520.

It is an arithmetic number, because the mean of its divisors is an integer number (108971520).

Almost surely, 2^217943039 is an apocalyptic number.

217943039 is a deficient number, since it is larger than the sum of its proper divisors (1).

217943039 is an equidigital number, since it uses as much as digits as its factorization.

217943039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 217943039 is about 14762.8939913555. The cubic root of 217943039 is about 601.7937423221.

The spelling of 217943039 in words is "two hundred seventeen million, nine hundred forty-three thousand, thirty-nine".