978220801 has 2 divisors, whose sum is σ = 978220802. Its totient is φ = 978220800.

The previous prime is 978220787. The next prime is 978220807. The reversal of 978220801 is 108022879.

978220801 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 706762225 + 271458576 = 26585^2 + 16476^2 .

It is a cyclic number.

It is not a de Polignac number, because 978220801 - 2⁷ = 978220673 is a prime.

It is not a weakly prime, because it can be changed into another prime (978220807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489110400 + 489110401.

It is an arithmetic number, because the mean of its divisors is an integer number (489110401).

Almost surely, 2^978220801 is an apocalyptic number.

It is an amenable number.

978220801 is a deficient number, since it is larger than the sum of its proper divisors (1).

978220801 is an equidigital number, since it uses as much as digits as its factorization.

978220801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 978220801 is about 31276.5215617082. The cubic root of 978220801 is about 992.6869161758.

The spelling of 978220801 in words is "nine hundred seventy-eight million, two hundred twenty thousand, eight hundred one".