813125 has 10 divisors (see below), whose sum is σ = 1016862. Its totient is φ = 650000.

The previous prime is 813121. The next prime is 813133. The reversal of 813125 is 521318.

It can be written as a sum of positive squares in 5 ways, for example, as 611524 + 201601 = 782^2 + 449^2 .

It is not a de Polignac number, because 813125 - 2² = 813121 is a prime.

It is a super-2 number, since 2×813125² = 1322344531250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 813097 and 813106.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 813125.

It is not an unprimeable number, because it can be changed into a prime (813121) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 26 + ... + 1275.

2⁸¹³¹²⁵ is an apocalyptic number.

It is an amenable number.

813125 is a deficient number, since it is larger than the sum of its proper divisors (203737).

813125 is an equidigital number, since it uses as much as digits as its factorization.

813125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321 (or 1306 counting only the distinct ones).

The product of its digits is 240, while the sum is 20.

The square root of 813125 is about 901.7344398436. The cubic root of 813125 is about 93.3366991417.

The spelling of 813125 in words is "eight hundred thirteen thousand, one hundred twenty-five".