216509039 has 2 divisors, whose sum is σ = 216509040. Its totient is φ = 216509038.

The previous prime is 216508997. The next prime is 216509077. The reversal of 216509039 is 930905612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216509039 - 2²⁰ = 215460463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216509539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108254519 + 108254520.

It is an arithmetic number, because the mean of its divisors is an integer number (108254520).

Almost surely, 2^216509039 is an apocalyptic number.

216509039 is a deficient number, since it is larger than the sum of its proper divisors (1).

216509039 is an equidigital number, since it uses as much as digits as its factorization.

216509039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 216509039 is about 14714.2461240799. The cubic root of 216509039 is about 600.4709626343.

The spelling of 216509039 in words is "two hundred sixteen million, five hundred nine thousand, thirty-nine".