201718939 has 2 divisors, whose sum is σ = 201718940. Its totient is φ = 201718938.

The previous prime is 201718921. The next prime is 201718943. The reversal of 201718939 is 939817102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201718939 is a prime.

It is not a weakly prime, because it can be changed into another prime (201718999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100859469 + 100859470.

It is an arithmetic number, because the mean of its divisors is an integer number (100859470).

Almost surely, 2^201718939 is an apocalyptic number.

201718939 is a deficient number, since it is larger than the sum of its proper divisors (1).

201718939 is an equidigital number, since it uses as much as digits as its factorization.

201718939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 201718939 is about 14202.7792702696. The cubic root of 201718939 is about 586.4741732811.

The spelling of 201718939 in words is "two hundred one million, seven hundred eighteen thousand, nine hundred thirty-nine".