825129817 has 4 divisors (see below), whose sum is σ = 825559056. Its totient is φ = 824700580.

The previous prime is 825129787. The next prime is 825129829. The reversal of 825129817 is 718921528.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 825129817 - 2²³ = 816741209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (825129887) 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 in 3 ways as a sum of consecutive naturals, for example, 211723 + ... + 215584.

It is an arithmetic number, because the mean of its divisors is an integer number (206389764).

Almost surely, 2^825129817 is an apocalyptic number.

It is an amenable number.

825129817 is a deficient number, since it is larger than the sum of its proper divisors (429239).

825129817 is a wasteful number, since it uses less digits than its factorization.

825129817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429238.

The product of its digits is 80640, while the sum is 43.

The square root of 825129817 is about 28725.0729677054. The cubic root of 825129817 is about 937.9379185988.

It can be divided in two parts, 82512 and 9817, that added together give a palindrome (92329).

The spelling of 825129817 in words is "eight hundred twenty-five million, one hundred twenty-nine thousand, eight hundred seventeen".