816817841 has 16 divisors (see below), whose sum is σ = 954809856. Its totient is φ = 684197376.

The previous prime is 816817831. The next prime is 816817843. The reversal of 816817841 is 148718618.

It is a cyclic number.

It is not a de Polignac number, because 816817841 - 2¹⁰ = 816816817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 816817792 and 816817801.

It is not an unprimeable number, because it can be changed into a prime (816817843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 280505 + ... + 283401.

It is an arithmetic number, because the mean of its divisors is an integer number (59675616).

Almost surely, 2^816817841 is an apocalyptic number.

It is an amenable number.

816817841 is a deficient number, since it is larger than the sum of its proper divisors (137992015).

816817841 is a wasteful number, since it uses less digits than its factorization.

816817841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3808.

The product of its digits is 86016, while the sum is 44.

The square root of 816817841 is about 28580.0252099259. The cubic root of 816817841 is about 934.7778327704. Note that the first 3 decimals are identical.

The spelling of 816817841 in words is "eight hundred sixteen million, eight hundred seventeen thousand, eight hundred forty-one".