978555587 has 2 divisors, whose sum is σ = 978555588. Its totient is φ = 978555586.

The previous prime is 978555577. The next prime is 978555607. The reversal of 978555587 is 785555879.

978555587 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (785555879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 978555587 - 2¹⁴ = 978539203 is a prime.

It is not a weakly prime, because it can be changed into another prime (978555527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489277793 + 489277794.

It is an arithmetic number, because the mean of its divisors is an integer number (489277794).

Almost surely, 2^978555587 is an apocalyptic number.

978555587 is a deficient number, since it is larger than the sum of its proper divisors (1).

978555587 is an equidigital number, since it uses as much as digits as its factorization.

978555587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17640000, while the sum is 59.

The square root of 978555587 is about 31281.8731376495. The cubic root of 978555587 is about 992.8001488855.

The spelling of 978555587 in words is "nine hundred seventy-eight million, five hundred fifty-five thousand, five hundred eighty-seven".