431661309 has 16 divisors (see below), whose sum is σ = 611908992. Its totient is φ = 270066368.

The previous prime is 431661281. The next prime is 431661313. The reversal of 431661309 is 903166134.

It is not a de Polignac number, because 431661309 - 2⁹ = 431660797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 431661309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431661319) 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 15 ways as a sum of consecutive naturals, for example, 55362 + ... + 62675.

It is an arithmetic number, because the mean of its divisors is an integer number (38244312).

Almost surely, 2^431661309 is an apocalyptic number.

It is an amenable number.

431661309 is a deficient number, since it is larger than the sum of its proper divisors (180247683).

431661309 is a wasteful number, since it uses less digits than its factorization.

431661309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118116.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 431661309 is about 20776.4604540812. The cubic root of 431661309 is about 755.7550209151.

The spelling of 431661309 in words is "four hundred thirty-one million, six hundred sixty-one thousand, three hundred nine".