825491 has 2 divisors, whose sum is σ = 825492. Its totient is φ = 825490.

The previous prime is 825479. The next prime is 825509. The reversal of 825491 is 194528.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-825491 is a prime.

It is a Sophie Germain prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 825491.

It is not a weakly prime, because it can be changed into another prime (825421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412745 + 412746.

It is an arithmetic number, because the mean of its divisors is an integer number (412746).

2⁸²⁵⁴⁹¹ is an apocalyptic number.

825491 is a deficient number, since it is larger than the sum of its proper divisors (1).

825491 is an equidigital number, since it uses as much as digits as its factorization.

825491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 29.

The square root of 825491 is about 908.5653526302. The cubic root of 825491 is about 93.8074752750.

The spelling of 825491 in words is "eight hundred twenty-five thousand, four hundred ninety-one".