978851 has 2 divisors, whose sum is σ = 978852. Its totient is φ = 978850.

The previous prime is 978839. The next prime is 978853. The reversal of 978851 is 158879.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 978851 - 2¹⁸ = 716707 is a prime.

Together with 978853, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (978853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489425 + 489426.

It is an arithmetic number, because the mean of its divisors is an integer number (489426).

2⁹⁷⁸⁸⁵¹ is an apocalyptic number.

978851 is a deficient number, since it is larger than the sum of its proper divisors (1).

978851 is an equidigital number, since it uses as much as digits as its factorization.

978851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 38.

The square root of 978851 is about 989.3689908219. The cubic root of 978851 is about 99.2900043249.

The spelling of 978851 in words is "nine hundred seventy-eight thousand, eight hundred fifty-one".