431309 has 4 divisors (see below), whose sum is σ = 443004. Its totient is φ = 419616.

The previous prime is 431297. The next prime is 431311. The reversal of 431309 is 903134.

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 354025 + 77284 = 595^2 + 278^2 .

It is a cyclic number.

It is not a de Polignac number, because 431309 - 2¹² = 427213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431329) 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, 5792 + ... + 5865.

It is an arithmetic number, because the mean of its divisors is an integer number (110751).

2⁴³¹³⁰⁹ is an apocalyptic number.

It is an amenable number.

431309 is a deficient number, since it is larger than the sum of its proper divisors (11695).

431309 is a wasteful number, since it uses less digits than its factorization.

431309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11694.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 431309 is about 656.7411971241. The cubic root of 431309 is about 75.5549356767.

It can be divided in two parts, 4 and 31309, that added together give a palindrome (31313).

The spelling of 431309 in words is "four hundred thirty-one thousand, three hundred nine".