981478809 has 16 divisors (see below), whose sum is σ = 1459192000. Its totient is φ = 652002048.

The previous prime is 981478807. The next prime is 981478829. The reversal of 981478809 is 908874189.

981478809 is a `hidden beast` number, since 98 + 1 + 478 + 80 + 9 = 666.

It is not a de Polignac number, because 981478809 - 2¹ = 981478807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981478807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56584 + ... + 71865.

It is an arithmetic number, because the mean of its divisors is an integer number (91199500).

Almost surely, 2^981478809 is an apocalyptic number.

It is an amenable number.

981478809 is a deficient number, since it is larger than the sum of its proper divisors (477713191).

981478809 is a wasteful number, since it uses less digits than its factorization.

981478809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128741 (or 128735 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 54.

The square root of 981478809 is about 31328.5621917125. The cubic root of 981478809 is about 993.7877576255.

The spelling of 981478809 in words is "nine hundred eighty-one million, four hundred seventy-eight thousand, eight hundred nine".