978001 has 2 divisors, whose sum is σ = 978002. Its totient is φ = 978000.

The previous prime is 977971. The next prime is 978007. The reversal of 978001 is 100879.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 641601 + 336400 = 801^2 + 580^2 .

It is a cyclic number.

It is not a de Polignac number, because 978001 - 2¹³ = 969809 is a prime.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (978007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489000 + 489001.

It is an arithmetic number, because the mean of its divisors is an integer number (489001).

2⁹⁷⁸⁰⁰¹ is an apocalyptic number.

It is an amenable number.

978001 is a deficient number, since it is larger than the sum of its proper divisors (1).

978001 is an equidigital number, since it uses as much as digits as its factorization.

978001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 978001 is about 988.9393307984. The cubic root of 978001 is about 99.2612560120.

The spelling of 978001 in words is "nine hundred seventy-eight thousand, one".