831409 has 2 divisors, whose sum is σ = 831410. Its totient is φ = 831408.

The previous prime is 831407. The next prime is 831431. The reversal of 831409 is 904138.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 739600 + 91809 = 860^2 + 303^2 .

It is a cyclic number.

It is not a de Polignac number, because 831409 - 2¹ = 831407 is a prime.

Together with 831407, it forms a pair of twin primes.

It is equal to p₆₆₂₆₅ and since 831409 and 66265 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (831407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415704 + 415705.

It is an arithmetic number, because the mean of its divisors is an integer number (415705).

2⁸³¹⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

831409 is a deficient number, since it is larger than the sum of its proper divisors (1).

831409 is an equidigital number, since it uses as much as digits as its factorization.

831409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 831409 is about 911.8163192222. The cubic root of 831409 is about 94.0311123811.

The spelling of 831409 in words is "eight hundred thirty-one thousand, four hundred nine".