816545133 has 6 divisors (see below), whose sum is σ = 1179454094. Its totient is φ = 544363416.

The previous prime is 816545123. The next prime is 816545143. The reversal of 816545133 is 331545618.

816545133 is a `hidden beast` number, since 81 + 6 + 545 + 1 + 33 = 666.

It is an interprime number because it is at equal distance from previous prime (816545123) and next prime (816545143).

It can be written as a sum of positive squares in only one way, i.e., 513158409 + 303386724 = 22653^2 + 17418^2 .

It is not a de Polignac number, because 816545133 - 2⁵ = 816545101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816545113) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45363610 + ... + 45363627.

Almost surely, 2^816545133 is an apocalyptic number.

It is an amenable number.

816545133 is a deficient number, since it is larger than the sum of its proper divisors (362908961).

816545133 is a wasteful number, since it uses less digits than its factorization.

816545133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90727243 (or 90727240 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 816545133 is about 28575.2538571401. The cubic root of 816545133 is about 934.6737908997.

The spelling of 816545133 in words is "eight hundred sixteen million, five hundred forty-five thousand, one hundred thirty-three".