481991481 has 6 divisors (see below), whose sum is σ = 696209930. Its totient is φ = 321327648.

The previous prime is 481991399. The next prime is 481991483. The reversal of 481991481 is 184199184.

481991481 is a `hidden beast` number, since 4 + 81 + 9 + 91 + 481 = 666.

It can be written as a sum of positive squares in only one way, i.e., 462938256 + 19053225 = 21516^2 + 4365^2 .

It is not a de Polignac number, because 481991481 - 2¹⁷ = 481860409 is a prime.

It is a super-2 number, since 2×481991481² = 464631575513146722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (481991483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26777296 + ... + 26777313.

Almost surely, 2^481991481 is an apocalyptic number.

It is an amenable number.

481991481 is a deficient number, since it is larger than the sum of its proper divisors (214218449).

481991481 is a wasteful number, since it uses less digits than its factorization.

481991481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53554615 (or 53554612 counting only the distinct ones).

The product of its digits is 82944, while the sum is 45.

The square root of 481991481 is about 21954.3043843343. The cubic root of 481991481 is about 784.0548653338.

The spelling of 481991481 in words is "four hundred eighty-one million, nine hundred ninety-one thousand, four hundred eighty-one".