811081215 has 128 divisors (see below), whose sum is σ = 1751040000. Its totient is φ = 347960448.

The previous prime is 811081213. The next prime is 811081247. The reversal of 811081215 is 512180118.

It is not a de Polignac number, because 811081215 - 2¹ = 811081213 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811081213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3572932 + ... + 3573158.

It is an arithmetic number, because the mean of its divisors is an integer number (13680000).

Almost surely, 2^811081215 is an apocalyptic number.

811081215 is an abundant number, since it is smaller than the sum of its proper divisors (939958785).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

811081215 is a wasteful number, since it uses less digits than its factorization.

811081215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466 (or 460 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 27.

The square root of 811081215 is about 28479.4876182841. The cubic root of 811081215 is about 932.5843311284.

The spelling of 811081215 in words is "eight hundred eleven million, eighty-one thousand, two hundred fifteen".