825775439 has 2 divisors, whose sum is σ = 825775440. Its totient is φ = 825775438.

The previous prime is 825775339. The next prime is 825775471. The reversal of 825775439 is 934577528.

825775439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-825775439 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (825775339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412887719 + 412887720.

It is an arithmetic number, because the mean of its divisors is an integer number (412887720).

Almost surely, 2^825775439 is an apocalyptic number.

825775439 is a deficient number, since it is larger than the sum of its proper divisors (1).

825775439 is an equidigital number, since it uses as much as digits as its factorization.

825775439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2116800, while the sum is 50.

The square root of 825775439 is about 28736.3087225900. The cubic root of 825775439 is about 938.1824843519.

The spelling of 825775439 in words is "eight hundred twenty-five million, seven hundred seventy-five thousand, four hundred thirty-nine".