815850081 has 12 divisors (see below), whose sum is σ = 1178758308. Its totient is φ = 543757824.

The previous prime is 815850059. The next prime is 815850097. The reversal of 815850081 is 180058518.

It can be written as a sum of positive squares in 2 ways, for example, as 755150400 + 60699681 = 27480^2 + 7791^2 .

It is not a de Polignac number, because 815850081 - 2²² = 811655777 is a prime.

It is a super-2 number, since 2×815850081² = 1331222709335413122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (815850001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33681 + ... + 52593.

It is an arithmetic number, because the mean of its divisors is an integer number (98229859).

Almost surely, 2^815850081 is an apocalyptic number.

It is an amenable number.

815850081 is a deficient number, since it is larger than the sum of its proper divisors (362908227).

815850081 is a wasteful number, since it uses less digits than its factorization.

815850081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23712 (or 23709 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 36.

The square root of 815850081 is about 28563.0894862583. The cubic root of 815850081 is about 934.4085141553.

The spelling of 815850081 in words is "eight hundred fifteen million, eight hundred fifty thousand, eighty-one".