431321005 has 16 divisors (see below), whose sum is σ = 525837744. Its totient is φ = 339596800.

The previous prime is 431320997. The next prime is 431321029. The reversal of 431321005 is 500123134.

It can be written as a sum of positive squares in 8 ways, for example, as 74753316 + 356567689 = 8646^2 + 18883^2 .

It is not a de Polignac number, because 431321005 - 2³ = 431320997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84897 + ... + 89833.

It is an arithmetic number, because the mean of its divisors is an integer number (32864859).

Almost surely, 2^431321005 is an apocalyptic number.

It is an amenable number.

431321005 is a deficient number, since it is larger than the sum of its proper divisors (94516739).

431321005 is a wasteful number, since it uses less digits than its factorization.

431321005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5216.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 431321005 is about 20768.2691864296. The cubic root of 431321005 is about 755.5563666570.

Adding to 431321005 its reverse (500123134), we get a palindrome (931444139).

The spelling of 431321005 in words is "four hundred thirty-one million, three hundred twenty-one thousand, five".