978863933 has 2 divisors, whose sum is σ = 978863934. Its totient is φ = 978863932.

The previous prime is 978863917. The next prime is 978863947. The reversal of 978863933 is 339368879.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 703204324 + 275659609 = 26518^2 + 16603^2 .

It is an emirp because it is prime and its reverse (339368879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 978863933 - 2⁴ = 978863917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978862933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489431966 + 489431967.

It is an arithmetic number, because the mean of its divisors is an integer number (489431967).

Almost surely, 2^978863933 is an apocalyptic number.

It is an amenable number.

978863933 is a deficient number, since it is larger than the sum of its proper divisors (1).

978863933 is an equidigital number, since it uses as much as digits as its factorization.

978863933 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5878656, while the sum is 56.

The square root of 978863933 is about 31286.8012586778. The cubic root of 978863933 is about 992.9044161037.

The spelling of 978863933 in words is "nine hundred seventy-eight million, eight hundred sixty-three thousand, nine hundred thirty-three".