816020811 has 10 divisors (see below), whose sum is σ = 1218994172. Its totient is φ = 544013820.

The previous prime is 816020809. The next prime is 816020813. The reversal of 816020811 is 118020618.

It is an interprime number because it is at equal distance from previous prime (816020809) and next prime (816020813).

It is not a de Polignac number, because 816020811 - 2¹ = 816020809 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816020813) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5037085 + ... + 5037246.

Almost surely, 2^816020811 is an apocalyptic number.

816020811 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

816020811 is a deficient number, since it is larger than the sum of its proper divisors (402973361).

816020811 is a wasteful number, since it uses less digits than its factorization.

816020811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10074343 (or 10074334 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 816020811 is about 28566.0779772093. The cubic root of 816020811 is about 934.4736897075.

The spelling of 816020811 in words is "eight hundred sixteen million, twenty thousand, eight hundred eleven".