81476305 has 4 divisors (see below), whose sum is σ = 97771572. Its totient is φ = 65181040.

The previous prime is 81476303. The next prime is 81476321. The reversal of 81476305 is 50367418.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51969681 + 29506624 = 7209^2 + 5432^2 .

It is not a de Polignac number, because 81476305 - 2¹ = 81476303 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81476303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8147626 + ... + 8147635.

It is an arithmetic number, because the mean of its divisors is an integer number (24442893).

Almost surely, 2^81476305 is an apocalyptic number.

It is an amenable number.

81476305 is a deficient number, since it is larger than the sum of its proper divisors (16295267).

81476305 is a wasteful number, since it uses less digits than its factorization.

81476305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16295266.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 81476305 is about 9026.4226025597. The cubic root of 81476305 is about 433.5213014245.

The spelling of 81476305 in words is "eighty-one million, four hundred seventy-six thousand, three hundred five".