978320929 has 2 divisors, whose sum is σ = 978320930. Its totient is φ = 978320928.

The previous prime is 978320923. The next prime is 978320957. The reversal of 978320929 is 929023879.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 913550625 + 64770304 = 30225^2 + 8048^2 .

It is a cyclic number.

It is not a de Polignac number, because 978320929 - 2⁵ = 978320897 is a prime.

It is a super-2 number, since 2×978320929² = 1914223680238846082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (978320923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489160464 + 489160465.

It is an arithmetic number, because the mean of its divisors is an integer number (489160465).

Almost surely, 2^978320929 is an apocalyptic number.

It is an amenable number.

978320929 is a deficient number, since it is larger than the sum of its proper divisors (1).

978320929 is an equidigital number, since it uses as much as digits as its factorization.

978320929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 978320929 is about 31278.1222102606. The cubic root of 978320929 is about 992.7207845909.

The spelling of 978320929 in words is "nine hundred seventy-eight million, three hundred twenty thousand, nine hundred twenty-nine".