825645917 has 2 divisors, whose sum is σ = 825645918. Its totient is φ = 825645916.

The previous prime is 825645911. The next prime is 825645959. The reversal of 825645917 is 719546528.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 566725636 + 258920281 = 23806^2 + 16091^2 .

It is a cyclic number.

It is not a de Polignac number, because 825645917 - 2⁶ = 825645853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (825645911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412822958 + 412822959.

It is an arithmetic number, because the mean of its divisors is an integer number (412822959).

Almost surely, 2^825645917 is an apocalyptic number.

It is an amenable number.

825645917 is a deficient number, since it is larger than the sum of its proper divisors (1).

825645917 is an equidigital number, since it uses as much as digits as its factorization.

825645917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 604800, while the sum is 47.

The square root of 825645917 is about 28734.0550044716. The cubic root of 825645917 is about 938.1334308119.

The spelling of 825645917 in words is "eight hundred twenty-five million, six hundred forty-five thousand, nine hundred seventeen".