978228929 has 2 divisors, whose sum is σ = 978228930. Its totient is φ = 978228928.

The previous prime is 978228883. The next prime is 978228949. The reversal of 978228929 is 929822879.

978228929 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 963978304 + 14250625 = 31048^2 + 3775^2 .

It is an emirp because it is prime and its reverse (929822879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 978228929 - 2²⁴ = 961451713 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (978228949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489114464 + 489114465.

It is an arithmetic number, because the mean of its divisors is an integer number (489114465).

Almost surely, 2^978228929 is an apocalyptic number.

It is an amenable number.

978228929 is a deficient number, since it is larger than the sum of its proper divisors (1).

978228929 is an equidigital number, since it uses as much as digits as its factorization.

978228929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 56.

The square root of 978228929 is about 31276.6514991615. The cubic root of 978228929 is about 992.6896655677.

The spelling of 978228929 in words is "nine hundred seventy-eight million, two hundred twenty-eight thousand, nine hundred twenty-nine".