825191 has 2 divisors, whose sum is σ = 825192. Its totient is φ = 825190.

The previous prime is 825161. The next prime is 825193. The reversal of 825191 is 191528.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 825191 - 2¹⁸ = 563047 is a prime.

Together with 825193, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 825191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (825193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412595 + 412596.

It is an arithmetic number, because the mean of its divisors is an integer number (412596).

2⁸²⁵¹⁹¹ is an apocalyptic number.

825191 is a deficient number, since it is larger than the sum of its proper divisors (1).

825191 is an equidigital number, since it uses as much as digits as its factorization.

825191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 26.

The square root of 825191 is about 908.4002421840. The cubic root of 825191 is about 93.7961100582.

The spelling of 825191 in words is "eight hundred twenty-five thousand, one hundred ninety-one".