816910919 has 8 divisors (see below), whose sum is σ = 892651008. Its totient is φ = 741416760.

The previous prime is 816910883. The next prime is 816910921. The reversal of 816910919 is 919019618.

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

It is a cyclic number.

It is not a de Polignac number, because 816910919 - 2²⁰ = 815862343 is a prime.

It is a super-2 number, since 2×816910919² = 1334686899162849122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 816910919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816910999) 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, 54497 + ... + 67850.

It is an arithmetic number, because the mean of its divisors is an integer number (111581376).

Almost surely, 2^816910919 is an apocalyptic number.

816910919 is a deficient number, since it is larger than the sum of its proper divisors (75740089).

816910919 is a wasteful number, since it uses less digits than its factorization.

816910919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122965.

The product of its (nonzero) digits is 34992, while the sum is 44.

The square root of 816910919 is about 28581.6535385901. The cubic root of 816910919 is about 934.8133380128.

The spelling of 816910919 in words is "eight hundred sixteen million, nine hundred ten thousand, nine hundred nineteen".