81282311 has 8 divisors (see below), whose sum is σ = 89042448. Its totient is φ = 73584000.

The previous prime is 81282307. The next prime is 81282319. The reversal of 81282311 is 11328218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81282311 - 2² = 81282307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81282319) 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 7 ways as a sum of consecutive naturals, for example, 12680 + ... + 17981.

It is an arithmetic number, because the mean of its divisors is an integer number (11130306).

Almost surely, 2^81282311 is an apocalyptic number.

81282311 is a deficient number, since it is larger than the sum of its proper divisors (7760137).

81282311 is a wasteful number, since it uses less digits than its factorization.

81282311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30913.

The product of its digits is 768, while the sum is 26.

The square root of 81282311 is about 9015.6703023125. The cubic root of 81282311 is about 433.1769585010.

The spelling of 81282311 in words is "eighty-one million, two hundred eighty-two thousand, three hundred eleven".