431391 has 4 divisors (see below), whose sum is σ = 575192. Its totient is φ = 287592.

The previous prime is 431381. The next prime is 431399. The reversal of 431391 is 193134.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 431391 - 2⁹ = 430879 is a prime.

It is a D-number.

It is a Duffinian number.

431391 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 431391.

It is not an unprimeable number, because it can be changed into a prime (431399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71896 + ... + 71901.

It is an arithmetic number, because the mean of its divisors is an integer number (143798).

2⁴³¹³⁹¹ is an apocalyptic number.

431391 is a deficient number, since it is larger than the sum of its proper divisors (143801).

431391 is a wasteful number, since it uses less digits than its factorization.

431391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143800.

The product of its digits is 324, while the sum is 21.

The square root of 431391 is about 656.8036236197. The cubic root of 431391 is about 75.5597235141.

The spelling of 431391 in words is "four hundred thirty-one thousand, three hundred ninety-one".