819894125 has 8 divisors (see below), whose sum is σ = 1023228024. Its totient is φ = 655915200.

The previous prime is 819894091. The next prime is 819894143. The reversal of 819894125 is 521498918.

It can be written as a sum of positive squares in 4 ways, for example, as 89056969 + 730837156 = 9437^2 + 27034^2 .

It is not a de Polignac number, because 819894125 - 2⁸ = 819893869 is a prime.

It is a Duffinian number.

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 819894125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3279452 + ... + 3279701.

It is an arithmetic number, because the mean of its divisors is an integer number (127903503).

Almost surely, 2^819894125 is an apocalyptic number.

It is an amenable number.

819894125 is a deficient number, since it is larger than the sum of its proper divisors (203333899).

819894125 is an equidigital number, since it uses as much as digits as its factorization.

819894125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6559168 (or 6559158 counting only the distinct ones).

The product of its digits is 207360, while the sum is 47.

The square root of 819894125 is about 28633.7934091870. The cubic root of 819894125 is about 935.9498768573.

The spelling of 819894125 in words is "eight hundred nineteen million, eight hundred ninety-four thousand, one hundred twenty-five".