978389099 has 2 divisors, whose sum is σ = 978389100. Its totient is φ = 978389098.

The previous prime is 978389053. The next prime is 978389107. The reversal of 978389099 is 990983879.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 978389099 - 2⁸ = 978388843 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (978389029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489194549 + 489194550.

It is an arithmetic number, because the mean of its divisors is an integer number (489194550).

Almost surely, 2^978389099 is an apocalyptic number.

978389099 is a deficient number, since it is larger than the sum of its proper divisors (1).

978389099 is an equidigital number, since it uses as much as digits as its factorization.

978389099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8817984, while the sum is 62.

The square root of 978389099 is about 31279.2119306098. The cubic root of 978389099 is about 992.7438418523.

The spelling of 978389099 in words is "nine hundred seventy-eight million, three hundred eighty-nine thousand, ninety-nine".