431441721 has 20 divisors (see below), whose sum is σ = 678422800. Its totient is φ = 272488536.

The previous prime is 431441713. The next prime is 431441723. The reversal of 431441721 is 127144134.

It is not a de Polignac number, because 431441721 - 2³ = 431441713 is a prime.

It is a super-2 number, since 2×431441721² = 372283917238883682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (431441723) 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 19 ways as a sum of consecutive naturals, for example, 138631 + ... + 141708.

It is an arithmetic number, because the mean of its divisors is an integer number (33921140).

Almost surely, 2^431441721 is an apocalyptic number.

It is an amenable number.

431441721 is a deficient number, since it is larger than the sum of its proper divisors (246981079).

431441721 is a wasteful number, since it uses less digits than its factorization.

431441721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280370 (or 280361 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 431441721 is about 20771.1752435918. The cubic root of 431441721 is about 755.6268472145.

Adding to 431441721 its reverse (127144134), we get a palindrome (558585855).

The spelling of 431441721 in words is "four hundred thirty-one million, four hundred forty-one thousand, seven hundred twenty-one".