978776801 has 2 divisors, whose sum is σ = 978776802. Its totient is φ = 978776800.

The previous prime is 978776791. The next prime is 978776809. The reversal of 978776801 is 108677879.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 967210000 + 11566801 = 31100^2 + 3401^2 .

It is a cyclic number.

It is not a de Polignac number, because 978776801 - 2¹⁸ = 978514657 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (978776809) 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, 489388400 + 489388401.

It is an arithmetic number, because the mean of its divisors is an integer number (489388401).

Almost surely, 2^978776801 is an apocalyptic number.

It is an amenable number.

978776801 is a deficient number, since it is larger than the sum of its proper divisors (1).

978776801 is an equidigital number, since it uses as much as digits as its factorization.

978776801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1185408, while the sum is 53.

The square root of 978776801 is about 31285.4087555205. The cubic root of 978776801 is about 992.8749546325.

The spelling of 978776801 in words is "nine hundred seventy-eight million, seven hundred seventy-six thousand, eight hundred one".