816496391 has 4 divisors (see below), whose sum is σ = 816697800. Its totient is φ = 816294984.

The previous prime is 816496357. The next prime is 816496393. The reversal of 816496391 is 193694618.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 816496391 - 2⁶ = 816496327 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 (816496393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94496 + ... + 102773.

It is an arithmetic number, because the mean of its divisors is an integer number (204174450).

Almost surely, 2^816496391 is an apocalyptic number.

816496391 is a deficient number, since it is larger than the sum of its proper divisors (201409).

816496391 is a wasteful number, since it uses less digits than its factorization.

816496391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201408.

The product of its digits is 279936, while the sum is 47.

The square root of 816496391 is about 28574.4009735987. The cubic root of 816496391 is about 934.6551927131.

The spelling of 816496391 in words is "eight hundred sixteen million, four hundred ninety-six thousand, three hundred ninety-one".