816041309 has 8 divisors (see below), whose sum is σ = 834395520. Its totient is φ = 797890176.

The previous prime is 816041251. The next prime is 816041321. The reversal of 816041309 is 903140618.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816041309 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 (816041609) 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, 42629 + ... + 58730.

It is an arithmetic number, because the mean of its divisors is an integer number (104299440).

Almost surely, 2^816041309 is an apocalyptic number.

It is an amenable number.

816041309 is a deficient number, since it is larger than the sum of its proper divisors (18354211).

816041309 is a wasteful number, since it uses less digits than its factorization.

816041309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101539.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 816041309 is about 28566.4367571456. The cubic root of 816041309 is about 934.4815141327.

The spelling of 816041309 in words is "eight hundred sixteen million, forty-one thousand, three hundred nine".