82011311 has 4 divisors (see below), whose sum is σ = 82034472. Its totient is φ = 81988152.

The previous prime is 82011263. The next prime is 82011313. The reversal of 82011311 is 11311028.

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

It is a cyclic number.

It is not a de Polignac number, because 82011311 - 2¹⁸ = 81749167 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 82011311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82011313) 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, 5036 + ... + 13761.

It is an arithmetic number, because the mean of its divisors is an integer number (20508618).

Almost surely, 2^82011311 is an apocalyptic number.

82011311 is a deficient number, since it is larger than the sum of its proper divisors (23161).

82011311 is a wasteful number, since it uses less digits than its factorization.

82011311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23160.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 82011311 is about 9056.0096620973. The cubic root of 82011311 is about 434.4681234430.

Adding to 82011311 its reverse (11311028), we get a palindrome (93322339).

The spelling of 82011311 in words is "eighty-two million, eleven thousand, three hundred eleven".