816349191 has 8 divisors (see below), whose sum is σ = 1243960704. Its totient is φ = 466485240.

The previous prime is 816349147. The next prime is 816349199. The reversal of 816349191 is 191943618.

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

It is not a de Polignac number, because 816349191 - 2¹⁹ = 815824903 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816349199) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19436865 + ... + 19436906.

It is an arithmetic number, because the mean of its divisors is an integer number (155495088).

Almost surely, 2^816349191 is an apocalyptic number.

816349191 is a deficient number, since it is larger than the sum of its proper divisors (427611513).

816349191 is a wasteful number, since it uses less digits than its factorization.

816349191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38873781.

The product of its digits is 46656, while the sum is 42.

The square root of 816349191 is about 28571.8251254623. The cubic root of 816349191 is about 934.5990220165.

The spelling of 816349191 in words is "eight hundred sixteen million, three hundred forty-nine thousand, one hundred ninety-one".