821489481 has 6 divisors (see below), whose sum is σ = 1186595930. Its totient is φ = 547659648.

The previous prime is 821489437. The next prime is 821489483. The reversal of 821489481 is 184984128.

821489481 is a `hidden beast` number, since 82 + 14 + 89 + 481 = 666.

It can be written as a sum of positive squares in only one way, i.e., 486599481 + 334890000 = 22059^2 + 18300^2 .

It is not a de Polignac number, because 821489481 - 2⁷ = 821489353 is a prime.

It is a super-2 number, since 2×821489481² = 1349689934787298722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (821489483) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45638296 + ... + 45638313.

Almost surely, 2^821489481 is an apocalyptic number.

It is an amenable number.

821489481 is a deficient number, since it is larger than the sum of its proper divisors (365106449).

821489481 is a wasteful number, since it uses less digits than its factorization.

821489481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91276615 (or 91276612 counting only the distinct ones).

The product of its digits is 147456, while the sum is 45.

The square root of 821489481 is about 28661.6377933990. The cubic root of 821489481 is about 936.5565429198.

The spelling of 821489481 in words is "eight hundred twenty-one million, four hundred eighty-nine thousand, four hundred eighty-one".