825220869 has 16 divisors (see below), whose sum is σ = 1228237824. Its totient is φ = 488502000.

The previous prime is 825220867. The next prime is 825220883. The reversal of 825220869 is 968022528.

It is not a de Polignac number, because 825220869 - 2¹ = 825220867 is a prime.

It is a super-2 number, since 2×825220869² = 1361978965266230322, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 825220869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (825220867) 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 15 ways as a sum of consecutive naturals, for example, 289357 + ... + 292194.

It is an arithmetic number, because the mean of its divisors is an integer number (76764864).

Almost surely, 2^825220869 is an apocalyptic number.

It is an amenable number.

825220869 is a deficient number, since it is larger than the sum of its proper divisors (403016955).

825220869 is a wasteful number, since it uses less digits than its factorization.

825220869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581608.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 825220869 is about 28726.6578111691. The cubic root of 825220869 is about 937.9724174055.

The spelling of 825220869 in words is "eight hundred twenty-five million, two hundred twenty thousand, eight hundred sixty-nine".