978617 has 2 divisors, whose sum is σ = 978618. Its totient is φ = 978616.

The previous prime is 978611. The next prime is 978619. The reversal of 978617 is 716879.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 541696 + 436921 = 736^2 + 661^2 .

It is a cyclic number.

It is not a de Polignac number, because 978617 - 2¹⁰ = 977593 is a prime.

It is a super-3 number, since 3×978617³ = 2811638763181233339, which contains 333 as substring.

Together with 978619, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a nialpdrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 978617.

It is not a weakly prime, because it can be changed into another prime (978611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489308 + 489309.

It is an arithmetic number, because the mean of its divisors is an integer number (489309).

2⁹⁷⁸⁶¹⁷ is an apocalyptic number.

It is an amenable number.

978617 is a deficient number, since it is larger than the sum of its proper divisors (1).

978617 is an equidigital number, since it uses as much as digits as its factorization.

978617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 38.

The square root of 978617 is about 989.2507265603. The cubic root of 978617 is about 99.2820917442.

The spelling of 978617 in words is "nine hundred seventy-eight thousand, six hundred seventeen".