819222725 has 12 divisors (see below), whose sum is σ = 1019091396. Its totient is φ = 653278080.

The previous prime is 819222721. The next prime is 819222731. The reversal of 819222725 is 527222918.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 100661089 + 718561636 = 10033^2 + 26806^2 .

It is not a de Polignac number, because 819222725 - 2² = 819222721 is a prime.

It is a super-2 number, since 2×819222725² = 1342251746312851250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819222721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44522 + ... + 60171.

It is an arithmetic number, because the mean of its divisors is an integer number (84924283).

Almost surely, 2^819222725 is an apocalyptic number.

It is an amenable number.

819222725 is a deficient number, since it is larger than the sum of its proper divisors (199868671).

819222725 is a wasteful number, since it uses less digits than its factorization.

819222725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105016 (or 105011 counting only the distinct ones).

The product of its digits is 40320, while the sum is 38.

The square root of 819222725 is about 28622.0670986566. The cubic root of 819222725 is about 935.6943282709.

The spelling of 819222725 in words is "eight hundred nineteen million, two hundred twenty-two thousand, seven hundred twenty-five".