431345 has 4 divisors (see below), whose sum is σ = 517620. Its totient is φ = 345072.

The previous prime is 431339. The next prime is 431363. The reversal of 431345 is 543134.

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 107584 + 323761 = 328^2 + 569^2 .

It is a cyclic number.

It is not a de Polignac number, because 431345 - 2⁴ = 431329 is a prime.

It is an Ulam 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, 43130 + ... + 43139.

It is an arithmetic number, because the mean of its divisors is an integer number (129405).

2⁴³¹³⁴⁵ is an apocalyptic number.

It is an amenable number.

431345 is a deficient number, since it is larger than the sum of its proper divisors (86275).

431345 is an equidigital number, since it uses as much as digits as its factorization.

431345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86274.

The product of its digits is 720, while the sum is 20.

The square root of 431345 is about 656.7686046090. The cubic root of 431345 is about 75.5570377288.

Adding to 431345 its reverse (543134), we get a palindrome (974479).

The spelling of 431345 in words is "four hundred thirty-one thousand, three hundred forty-five".