978317387 has 2 divisors, whose sum is σ = 978317388. Its totient is φ = 978317386.

The previous prime is 978317369. The next prime is 978317393. The reversal of 978317387 is 783713879.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 978317387 - 2¹⁶ = 978251851 is a prime.

It is not a weakly prime, because it can be changed into another prime (978317287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489158693 + 489158694.

It is an arithmetic number, because the mean of its divisors is an integer number (489158694).

Almost surely, 2^978317387 is an apocalyptic number.

978317387 is a deficient number, since it is larger than the sum of its proper divisors (1).

978317387 is an equidigital number, since it uses as much as digits as its factorization.

978317387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1778112, while the sum is 53.

The square root of 978317387 is about 31278.0655891633. The cubic root of 978317387 is about 992.7195865446.

The spelling of 978317387 in words is "nine hundred seventy-eight million, three hundred seventeen thousand, three hundred eighty-seven".