978917 has 2 divisors, whose sum is σ = 978918. Its totient is φ = 978916.

The previous prime is 978907. The next prime is 978931. The reversal of 978917 is 719879.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 829921 + 148996 = 911^2 + 386^2 .

It is a cyclic number.

It is not a de Polignac number, because 978917 - 2⁶ = 978853 is a prime.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 978917.

It is not a weakly prime, because it can be changed into another prime (978907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489458 + 489459.

It is an arithmetic number, because the mean of its divisors is an integer number (489459).

2⁹⁷⁸⁹¹⁷ is an apocalyptic number.

It is an amenable number.

978917 is a deficient number, since it is larger than the sum of its proper divisors (1).

978917 is an equidigital number, since it uses as much as digits as its factorization.

978917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 41.

The square root of 978917 is about 989.4023448527. The cubic root of 978917 is about 99.2922358504.

The spelling of 978917 in words is "nine hundred seventy-eight thousand, nine hundred seventeen".