816286253 has 4 divisors (see below), whose sum is σ = 816780540. Its totient is φ = 815791968.

The previous prime is 816286217. The next prime is 816286321. The reversal of 816286253 is 352682618.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 352682618 = 2 ⋅176341309.

It can be written as a sum of positive squares in 2 ways, for example, as 536292964 + 279993289 = 23158^2 + 16733^2 .

It is a cyclic number.

It is not a de Polignac number, because 816286253 - 2¹² = 816282157 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 816286253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816286153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244658 + ... + 247971.

It is an arithmetic number, because the mean of its divisors is an integer number (204195135).

Almost surely, 2^816286253 is an apocalyptic number.

It is an amenable number.

816286253 is a deficient number, since it is larger than the sum of its proper divisors (494287).

816286253 is a wasteful number, since it uses less digits than its factorization.

816286253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494286.

The product of its digits is 138240, while the sum is 41.

The square root of 816286253 is about 28570.7237045196. The cubic root of 816286253 is about 934.5750031671.

The spelling of 816286253 in words is "eight hundred sixteen million, two hundred eighty-six thousand, two hundred fifty-three".