978041789 has 2 divisors, whose sum is σ = 978041790. Its totient is φ = 978041788.

The previous prime is 978041783. The next prime is 978041821. The reversal of 978041789 is 987140879.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 940464889 + 37576900 = 30667^2 + 6130^2 .

It is an emirp because it is prime and its reverse (987140879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 978041789 - 2²⁴ = 961264573 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 978041789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978041783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489020894 + 489020895.

It is an arithmetic number, because the mean of its divisors is an integer number (489020895).

Almost surely, 2^978041789 is an apocalyptic number.

It is an amenable number.

978041789 is a deficient number, since it is larger than the sum of its proper divisors (1).

978041789 is an equidigital number, since it uses as much as digits as its factorization.

978041789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1016064, while the sum is 53.

The square root of 978041789 is about 31273.6596675221. The cubic root of 978041789 is about 992.6263593939.

The spelling of 978041789 in words is "nine hundred seventy-eight million, forty-one thousand, seven hundred eighty-nine".