815065133 has 4 divisors (see below), whose sum is σ = 818447388. Its totient is φ = 811682880.

The previous prime is 815065127. The next prime is 815065151. The reversal of 815065133 is 331560518.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 331560518 = 2 ⋅165780259.

It can be written as a sum of positive squares in 2 ways, for example, as 449567209 + 365497924 = 21203^2 + 19118^2 .

It is a cyclic number.

It is not a de Polignac number, because 815065133 - 2²⁶ = 747956269 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 815065133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815065033) 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 3 ways as a sum of consecutive naturals, for example, 1690766 + ... + 1691247.

It is an arithmetic number, because the mean of its divisors is an integer number (204611847).

Almost surely, 2^815065133 is an apocalyptic number.

It is an amenable number.

815065133 is a deficient number, since it is larger than the sum of its proper divisors (3382255).

815065133 is a wasteful number, since it uses less digits than its factorization.

815065133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3382254.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 815065133 is about 28549.3455791897. The cubic root of 815065133 is about 934.1087460712.

The spelling of 815065133 in words is "eight hundred fifteen million, sixty-five thousand, one hundred thirty-three".