981478581 has 24 divisors (see below), whose sum is σ = 1383450720. Its totient is φ = 618193632.

The previous prime is 981478577. The next prime is 981478621. The reversal of 981478581 is 185874189.

It is a happy number.

It is not a de Polignac number, because 981478581 - 2² = 981478577 is a prime.

It is a super-2 number, since 2×981478581² = 1926600409923547122, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981478571) 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 23 ways as a sum of consecutive naturals, for example, 189630 + ... + 194736.

It is an arithmetic number, because the mean of its divisors is an integer number (57643780).

Almost surely, 2^981478581 is an apocalyptic number.

It is an amenable number.

981478581 is a deficient number, since it is larger than the sum of its proper divisors (401972139).

981478581 is a wasteful number, since it uses less digits than its factorization.

981478581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5233 (or 5186 counting only the distinct ones).

The product of its digits is 645120, while the sum is 51.

The square root of 981478581 is about 31328.5585528604. The cubic root of 981478581 is about 993.7876806724.

The spelling of 981478581 in words is "nine hundred eighty-one million, four hundred seventy-eight thousand, five hundred eighty-one".