978488851 has 2 divisors, whose sum is σ = 978488852. Its totient is φ = 978488850.

The previous prime is 978488831. The next prime is 978488869. The reversal of 978488851 is 158884879.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-978488851 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (978488801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489244425 + 489244426.

It is an arithmetic number, because the mean of its divisors is an integer number (489244426).

Almost surely, 2^978488851 is an apocalyptic number.

978488851 is a deficient number, since it is larger than the sum of its proper divisors (1).

978488851 is an equidigital number, since it uses as much as digits as its factorization.

978488851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5160960, while the sum is 58.

The square root of 978488851 is about 31280.8064314205. The cubic root of 978488851 is about 992.7775792200. Note that the first 3 decimals are identical.

The spelling of 978488851 in words is "nine hundred seventy-eight million, four hundred eighty-eight thousand, eight hundred fifty-one".