431216605 has 4 divisors (see below), whose sum is σ = 517459932. Its totient is φ = 344973280.

The previous prime is 431216593. The next prime is 431216629. The reversal of 431216605 is 506612134.

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 84437721 + 346778884 = 9189^2 + 18622^2 .

It is not a de Polignac number, because 431216605 - 2²³ = 422827997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43121656 + ... + 43121665.

It is an arithmetic number, because the mean of its divisors is an integer number (129364983).

Almost surely, 2^431216605 is an apocalyptic number.

It is an amenable number.

431216605 is a deficient number, since it is larger than the sum of its proper divisors (86243327).

431216605 is an equidigital number, since it uses as much as digits as its factorization.

431216605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86243326.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 431216605 is about 20765.7555846157. The cubic root of 431216605 is about 755.4954016612.

Adding to 431216605 its reverse (506612134), we get a palindrome (937828739).

The spelling of 431216605 in words is "four hundred thirty-one million, two hundred sixteen thousand, six hundred five".