431609 has 4 divisors (see below), whose sum is σ = 437760. Its totient is φ = 425460.

The previous prime is 431603. The next prime is 431611. The reversal of 431609 is 906134.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 431609 - 2¹² = 427513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (431603) 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, 2969 + ... + 3110.

It is an arithmetic number, because the mean of its divisors is an integer number (109440).

2⁴³¹⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

431609 is a deficient number, since it is larger than the sum of its proper divisors (6151).

431609 is an equidigital number, since it uses as much as digits as its factorization.

431609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6150.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 431609 is about 656.9695578944. The cubic root of 431609 is about 75.5724492053.

It can be divided in two parts, 4 and 31609, that added together give a palindrome (31613).

The spelling of 431609 in words is "four hundred thirty-one thousand, six hundred nine".