978049889 has 2 divisors, whose sum is σ = 978049890. Its totient is φ = 978049888.

The previous prime is 978049883. The next prime is 978049913. The reversal of 978049889 is 988940879.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 725494225 + 252555664 = 26935^2 + 15892^2 .

It is a cyclic number.

It is not a de Polignac number, because 978049889 - 2⁴ = 978049873 is a prime.

It is not a weakly prime, because it can be changed into another prime (978049883) 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, 489024944 + 489024945.

It is an arithmetic number, because the mean of its divisors is an integer number (489024945).

Almost surely, 2^978049889 is an apocalyptic number.

It is an amenable number.

978049889 is a deficient number, since it is larger than the sum of its proper divisors (1).

978049889 is an equidigital number, since it uses as much as digits as its factorization.

978049889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10450944, while the sum is 62.

The square root of 978049889 is about 31273.7891692069. The cubic root of 978049889 is about 992.6290996488.

The spelling of 978049889 in words is "nine hundred seventy-eight million, forty-nine thousand, eight hundred eighty-nine".