811287005 has 16 divisors (see below), whose sum is σ = 1034097840. Its totient is φ = 608904192.

The previous prime is 811286999. The next prime is 811287017. The reversal of 811287005 is 500782118.

It is a happy number.

811287005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 57729604 + 753557401 = 7598^2 + 27451^2 .

It is a cyclic number.

It is not a de Polignac number, because 811287005 - 2¹⁶ = 811221469 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11891 + ... + 41999.

It is an arithmetic number, because the mean of its divisors is an integer number (64631115).

Almost surely, 2^811287005 is an apocalyptic number.

811287005 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

811287005 is a deficient number, since it is larger than the sum of its proper divisors (222810835).

811287005 is a wasteful number, since it uses less digits than its factorization.

811287005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30448.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 811287005 is about 28483.1003403773. The cubic root of 811287005 is about 932.6631971725.

The spelling of 811287005 in words is "eight hundred eleven million, two hundred eighty-seven thousand, five".