978688099 has 2 divisors, whose sum is σ = 978688100. Its totient is φ = 978688098.

The previous prime is 978687979. The next prime is 978688121. The reversal of 978688099 is 990886879.

978688099 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 is a cyclic number.

It is not a de Polignac number, because 978688099 - 2⁷ = 978687971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 978688099.

It is not a weakly prime, because it can be changed into another prime (978688199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489344049 + 489344050.

It is an arithmetic number, because the mean of its divisors is an integer number (489344050).

Almost surely, 2^978688099 is an apocalyptic number.

978688099 is a deficient number, since it is larger than the sum of its proper divisors (1).

978688099 is an equidigital number, since it uses as much as digits as its factorization.

978688099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15676416, while the sum is 64.

The square root of 978688099 is about 31283.9910976845. The cubic root of 978688099 is about 992.8449605097.

It can be divided in two parts, 97 and 8688099, that added together give a triangular number (8688196 = T₄₁₆₈).

The spelling of 978688099 in words is "nine hundred seventy-eight million, six hundred eighty-eight thousand, ninety-nine".