81273311 has 24 divisors (see below), whose sum is σ = 102476880. Its totient is φ = 64012032.

The previous prime is 81273307. The next prime is 81273331. The reversal of 81273311 is 11337218.

It is not a de Polignac number, because 81273311 - 2² = 81273307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81273301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34685 + ... + 36953.

It is an arithmetic number, because the mean of its divisors is an integer number (4269870).

Almost surely, 2^81273311 is an apocalyptic number.

81273311 is a deficient number, since it is larger than the sum of its proper divisors (21203569).

81273311 is a wasteful number, since it uses less digits than its factorization.

81273311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2343 (or 2336 counting only the distinct ones).

The product of its digits is 1008, while the sum is 26.

The square root of 81273311 is about 9015.1711575544. The cubic root of 81273311 is about 433.1609700427.

The spelling of 81273311 in words is "eighty-one million, two hundred seventy-three thousand, three hundred eleven".