918971 has 2 divisors, whose sum is σ = 918972. Its totient is φ = 918970.

The previous prime is 918959. The next prime is 918989. The reversal of 918971 is 179819.

It is a weak prime.

It is an emirp because it is prime and its reverse (179819) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-918971 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (918371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459485 + 459486.

It is an arithmetic number, because the mean of its divisors is an integer number (459486).

2⁹¹⁸⁹⁷¹ is an apocalyptic number.

918971 is a deficient number, since it is larger than the sum of its proper divisors (1).

918971 is an equidigital number, since it uses as much as digits as its factorization.

918971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 35.

The square root of 918971 is about 958.6297512596. The cubic root of 918971 is about 97.2226084459. Note that the first 3 decimals are identical.

The spelling of 918971 in words is "nine hundred eighteen thousand, nine hundred seventy-one".