816541518 has 32 divisors (see below), whose sum is σ = 1862161056. Its totient is φ = 236464128.

The previous prime is 816541513. The next prime is 816541543. The reversal of 816541518 is 815145618.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816541513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 306571 + ... + 309222.

It is an arithmetic number, because the mean of its divisors is an integer number (58192533).

Almost surely, 2^816541518 is an apocalyptic number.

816541518 is an abundant number, since it is smaller than the sum of its proper divisors (1045619538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

816541518 is a wasteful number, since it uses less digits than its factorization.

816541518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615828.

The product of its digits is 38400, while the sum is 39.

The square root of 816541518 is about 28575.1906030389. The cubic root of 816541518 is about 934.6724115717.

The spelling of 816541518 in words is "eight hundred sixteen million, five hundred forty-one thousand, five hundred eighteen".