431471311721 has 4 divisors (see below), whose sum is σ = 434620737492. Its totient is φ = 428321885952.

The previous prime is 431471311633. The next prime is 431471311729. The reversal of 431471311721 is 127113174134.

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 328484874496 + 102986437225 = 573136^2 + 320915^2 .

It is a cyclic number.

It is not a de Polignac number, because 431471311721 - 2¹⁸ = 431471049577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (431471311729) 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, 1574712680 + ... + 1574712953.

It is an arithmetic number, because the mean of its divisors is an integer number (108655184373).

Almost surely, 2^431471311721 is an apocalyptic number.

It is an amenable number.

431471311721 is a deficient number, since it is larger than the sum of its proper divisors (3149425771).

431471311721 is a wasteful number, since it uses less digits than its factorization.

431471311721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3149425770.

The product of its digits is 14112, while the sum is 35.

Adding to 431471311721 its reverse (127113174134), we get a palindrome (558584485855).

The spelling of 431471311721 in words is "four hundred thirty-one billion, four hundred seventy-one million, three hundred eleven thousand, seven hundred twenty-one".