217913039 has 2 divisors, whose sum is σ = 217913040. Its totient is φ = 217913038.

The previous prime is 217913023. The next prime is 217913041. The reversal of 217913039 is 930319712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 217913039 - 2⁴ = 217913023 is a prime.

Together with 217913041, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217913639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108956519 + 108956520.

It is an arithmetic number, because the mean of its divisors is an integer number (108956520).

Almost surely, 2^217913039 is an apocalyptic number.

217913039 is a deficient number, since it is larger than the sum of its proper divisors (1).

217913039 is an equidigital number, since it uses as much as digits as its factorization.

217913039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206, while the sum is 35.

The square root of 217913039 is about 14761.8778954441. The cubic root of 217913039 is about 601.7661286227.

The spelling of 217913039 in words is "two hundred seventeen million, nine hundred thirteen thousand, thirty-nine".