811431 has 16 divisors (see below), whose sum is σ = 1233120. Its totient is φ = 527040.

The previous prime is 811429. The next prime is 811441. The reversal of 811431 is 134118.

811431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 811431 - 2¹ = 811429 is a prime.

It is a super-2 number, since 2×811431² = 1316840535522, which contains 22 as substring.

811431 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 811431.

It is not an unprimeable number, because it can be changed into a prime (811411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 741 + ... + 1473.

It is an arithmetic number, because the mean of its divisors is an integer number (77070).

2⁸¹¹⁴³¹ is an apocalyptic number.

811431 is a deficient number, since it is larger than the sum of its proper divisors (421689).

811431 is a wasteful number, since it uses less digits than its factorization.

811431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783 (or 777 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 811431 is about 900.7946491848. The cubic root of 811431 is about 93.2718373245.

Adding to 811431 its reverse (134118), we get a palindrome (945549).

The spelling of 811431 in words is "eight hundred eleven thousand, four hundred thirty-one".