81327273 has 4 divisors (see below), whose sum is σ = 108436368. Its totient is φ = 54218180.

The previous prime is 81327271. The next prime is 81327293. The reversal of 81327273 is 37272318.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81327273 - 2¹ = 81327271 is a prime.

It is a super-2 number, since 2×81327273² = 13228250667233058, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81327271) 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, 13554543 + ... + 13554548.

It is an arithmetic number, because the mean of its divisors is an integer number (27109092).

Almost surely, 2^81327273 is an apocalyptic number.

It is an amenable number.

81327273 is a deficient number, since it is larger than the sum of its proper divisors (27109095).

81327273 is a wasteful number, since it uses less digits than its factorization.

81327273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27109094.

The product of its digits is 14112, while the sum is 33.

The square root of 81327273 is about 9018.1635048384. The cubic root of 81327273 is about 433.2568156149.

The spelling of 81327273 in words is "eighty-one million, three hundred twenty-seven thousand, two hundred seventy-three".