819798025 has 6 divisors (see below), whose sum is σ = 1016549582. Its totient is φ = 655838400.

The previous prime is 819797981. The next prime is 819798037. The reversal of 819798025 is 520897918.

It can be written as a sum of positive squares in 3 ways, for example, as 238795209 + 581002816 = 15453^2 + 24104^2 .

It is a de Polignac number, because none of the positive numbers 2^k-819798025 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 819798025.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16395936 + ... + 16395985.

Almost surely, 2^819798025 is an apocalyptic number.

It is an amenable number.

819798025 is a deficient number, since it is larger than the sum of its proper divisors (196751557).

819798025 is a wasteful number, since it uses less digits than its factorization.

819798025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32791931 (or 32791926 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 49.

The square root of 819798025 is about 28632.1152728889. The cubic root of 819798025 is about 935.9133077871.

The spelling of 819798025 in words is "eight hundred nineteen million, seven hundred ninety-eight thousand, twenty-five".