816513419 has 4 divisors (see below), whose sum is σ = 828013680. Its totient is φ = 805013160.

The previous prime is 816513403. The next prime is 816513457. The reversal of 816513419 is 914315618.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 914315618 = 2 ⋅457157809.

It is a cyclic number.

It is not a de Polignac number, because 816513419 - 2⁴ = 816513403 is a prime.

It is a super-2 number, since 2×816513419² = 1333388326814139122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816512419) 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, 5750024 + ... + 5750165.

It is an arithmetic number, because the mean of its divisors is an integer number (207003420).

Almost surely, 2^816513419 is an apocalyptic number.

816513419 is a deficient number, since it is larger than the sum of its proper divisors (11500261).

816513419 is a wasteful number, since it uses less digits than its factorization.

816513419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11500260.

The product of its digits is 25920, while the sum is 38.

The square root of 816513419 is about 28574.6989310474. The cubic root of 816513419 is about 934.6616900670.

The spelling of 816513419 in words is "eight hundred sixteen million, five hundred thirteen thousand, four hundred nineteen".