825431 has 4 divisors (see below), whose sum is σ = 831864. Its totient is φ = 819000.

The previous prime is 825421. The next prime is 825439. The reversal of 825431 is 134528.

825431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 825431 - 2¹⁸ = 563287 is a prime.

It is a super-2 number, since 2×825431² = 1362672671522, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 825397 and 825406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (825439) 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, 3020 + ... + 3281.

It is an arithmetic number, because the mean of its divisors is an integer number (207966).

2⁸²⁵⁴³¹ is an apocalyptic number.

825431 is a deficient number, since it is larger than the sum of its proper divisors (6433).

825431 is a wasteful number, since it uses less digits than its factorization.

825431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6432.

The product of its digits is 960, while the sum is 23.

The square root of 825431 is about 908.5323329414. The cubic root of 825431 is about 93.8052024519.

Adding to 825431 its reverse (134528), we get a palindrome (959959).

The spelling of 825431 in words is "eight hundred twenty-five thousand, four hundred thirty-one".