81803315 has 32 divisors (see below), whose sum is σ = 110453760. Its totient is φ = 57657600.

The previous prime is 81803311. The next prime is 81803317. The reversal of 81803315 is 51330818.

It is not a de Polignac number, because 81803315 - 2² = 81803311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81803311) 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 31 ways as a sum of consecutive naturals, for example, 290975 + ... + 291255.

It is an arithmetic number, because the mean of its divisors is an integer number (3451680).

Almost surely, 2^81803315 is an apocalyptic number.

81803315 is a deficient number, since it is larger than the sum of its proper divisors (28650445).

81803315 is a wasteful number, since it uses less digits than its factorization.

81803315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 81803315 is about 9044.5185057028. The cubic root of 81803315 is about 434.1005150610.

The spelling of 81803315 in words is "eighty-one million, eight hundred three thousand, three hundred fifteen".