816824261 has 8 divisors (see below), whose sum is σ = 906184800. Its totient is φ = 729981040.

The previous prime is 816824251. The next prime is 816824273. The reversal of 816824261 is 162428618.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 816824261 - 2²² = 812629957 is a prime.

It is a super-2 number, since 2×816824261² = 1334403746716392242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816824201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 628646 + ... + 629943.

It is an arithmetic number, because the mean of its divisors is an integer number (113273100).

Almost surely, 2^816824261 is an apocalyptic number.

It is an amenable number.

816824261 is a deficient number, since it is larger than the sum of its proper divisors (89360539).

816824261 is a wasteful number, since it uses less digits than its factorization.

816824261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258659.

The product of its digits is 36864, while the sum is 38.

The square root of 816824261 is about 28580.1375259112. The cubic root of 816824261 is about 934.7802818101.

The spelling of 816824261 in words is "eight hundred sixteen million, eight hundred twenty-four thousand, two hundred sixty-one".