811585086 has 32 divisors (see below), whose sum is σ = 1761395328. Its totient is φ = 247809120.

The previous prime is 811585079. The next prime is 811585087. The reversal of 811585086 is 680585118.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811585087) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29496 + ... + 49931.

It is an arithmetic number, because the mean of its divisors is an integer number (55043604).

Almost surely, 2^811585086 is an apocalyptic number.

811585086 is an abundant number, since it is smaller than the sum of its proper divisors (949810242).

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

811585086 is a wasteful number, since it uses less digits than its factorization.

811585086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79576.

The product of its (nonzero) digits is 76800, while the sum is 42.

The square root of 811585086 is about 28488.3324538310. The cubic root of 811585086 is about 932.7774087627. Note that the first 3 decimals are identical.

The spelling of 811585086 in words is "eight hundred eleven million, five hundred eighty-five thousand, eighty-six".