978555607 has 2 divisors, whose sum is σ = 978555608. Its totient is φ = 978555606.

The previous prime is 978555587. The next prime is 978555619. The reversal of 978555607 is 706555879.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-978555607 is a prime.

It is a super-2 number, since 2×978555607² = 1915142151982276898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978555307) 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, 489277803 + 489277804.

It is an arithmetic number, because the mean of its divisors is an integer number (489277804).

Almost surely, 2^978555607 is an apocalyptic number.

978555607 is a deficient number, since it is larger than the sum of its proper divisors (1).

978555607 is an equidigital number, since it uses as much as digits as its factorization.

978555607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2646000, while the sum is 52.

The square root of 978555607 is about 31281.8734573235. The cubic root of 978555607 is about 992.8001556493.

The spelling of 978555607 in words is "nine hundred seventy-eight million, five hundred fifty-five thousand, six hundred seven".