481881721 has 4 divisors (see below), whose sum is σ = 482163444. Its totient is φ = 481600000.

The previous prime is 481881707. The next prime is 481881727. The reversal of 481881721 is 127188184.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 221414400 + 260467321 = 14880^2 + 16139^2 .

It is a cyclic number.

It is not a de Polignac number, because 481881721 - 2⁹ = 481881209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (481881727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138280 + ... + 141721.

It is an arithmetic number, because the mean of its divisors is an integer number (120540861).

Almost surely, 2^481881721 is an apocalyptic number.

It is an amenable number.

481881721 is a deficient number, since it is larger than the sum of its proper divisors (281723).

481881721 is a wasteful number, since it uses less digits than its factorization.

481881721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281722.

The product of its digits is 28672, while the sum is 40.

The square root of 481881721 is about 21951.8045044138. The cubic root of 481881721 is about 783.9953453363.

The spelling of 481881721 in words is "four hundred eighty-one million, eight hundred eighty-one thousand, seven hundred twenty-one".