978317293 has 2 divisors, whose sum is σ = 978317294. Its totient is φ = 978317292.

The previous prime is 978317287. The next prime is 978317369. The reversal of 978317293 is 392713879.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 978250729 + 66564 = 31277^2 + 258^2 .

It is an emirp because it is prime and its reverse (392713879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 978317293 - 2¹⁷ = 978186221 is a prime.

It is a super-3 number, since 3×978317293³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978317203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489158646 + 489158647.

It is an arithmetic number, because the mean of its divisors is an integer number (489158647).

Almost surely, 2^978317293 is an apocalyptic number.

It is an amenable number.

978317293 is a deficient number, since it is larger than the sum of its proper divisors (1).

978317293 is an equidigital number, since it uses as much as digits as its factorization.

978317293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 49.

The square root of 978317293 is about 31278.0640865128. The cubic root of 978317293 is about 992.7195547500.

The spelling of 978317293 in words is "nine hundred seventy-eight million, three hundred seventeen thousand, two hundred ninety-three".