978988609 has 2 divisors, whose sum is σ = 978988610. Its totient is φ = 978988608.

The previous prime is 978988597. The next prime is 978988613. The reversal of 978988609 is 906889879.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 977937984 + 1050625 = 31272^2 + 1025^2 .

It is a cyclic number.

It is not a de Polignac number, because 978988609 - 2⁷ = 978988481 is a prime.

It is not a weakly prime, because it can be changed into another prime (978988669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489494304 + 489494305.

It is an arithmetic number, because the mean of its divisors is an integer number (489494305).

Almost surely, 2^978988609 is an apocalyptic number.

It is an amenable number.

978988609 is a deficient number, since it is larger than the sum of its proper divisors (1).

978988609 is an equidigital number, since it uses as much as digits as its factorization.

978988609 is an evil number, because the sum of its binary digits is even.

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

The square root of 978988609 is about 31288.7936648251. The cubic root of 978988609 is about 992.9465690838.

The spelling of 978988609 in words is "nine hundred seventy-eight million, nine hundred eighty-eight thousand, six hundred nine".