978722659 has 2 divisors, whose sum is σ = 978722660. Its totient is φ = 978722658.

The previous prime is 978722639. The next prime is 978722707. The reversal of 978722659 is 956227879.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 978722659 - 2⁵ = 978722627 is a prime.

It is not a weakly prime, because it can be changed into another prime (978722609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489361329 + 489361330.

It is an arithmetic number, because the mean of its divisors is an integer number (489361330).

Almost surely, 2^978722659 is an apocalyptic number.

978722659 is a deficient number, since it is larger than the sum of its proper divisors (1).

978722659 is an equidigital number, since it uses as much as digits as its factorization.

978722659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3810240, while the sum is 55.

The square root of 978722659 is about 31284.5434519988. The cubic root of 978722659 is about 992.8566470105.

The spelling of 978722659 in words is "nine hundred seventy-eight million, seven hundred twenty-two thousand, six hundred fifty-nine".