816343491 has 16 divisors (see below), whose sum is σ = 1124517888. Its totient is φ = 526228800.

The previous prime is 816343483. The next prime is 816343537. The reversal of 816343491 is 194343618.

It is not a de Polignac number, because 816343491 - 2³ = 816343483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (816343441) 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 15 ways as a sum of consecutive naturals, for example, 134770 + ... + 140696.

It is an arithmetic number, because the mean of its divisors is an integer number (70282368).

Almost surely, 2^816343491 is an apocalyptic number.

816343491 is a deficient number, since it is larger than the sum of its proper divisors (308174397).

816343491 is a wasteful number, since it uses less digits than its factorization.

816343491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7442.

The product of its digits is 62208, while the sum is 39.

The square root of 816343491 is about 28571.7253766727. The cubic root of 816343491 is about 934.5968467926.

The spelling of 816343491 in words is "eight hundred sixteen million, three hundred forty-three thousand, four hundred ninety-one".