82031311 has 4 divisors (see below), whose sum is σ = 82064632. Its totient is φ = 81997992.

The previous prime is 82031293. The next prime is 82031351. The reversal of 82031311 is 11313028.

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 82031311 - 2¹¹ = 82029263 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 (82031351) 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, 12645 + ... + 17998.

It is an arithmetic number, because the mean of its divisors is an integer number (20516158).

Almost surely, 2^82031311 is an apocalyptic number.

82031311 is a deficient number, since it is larger than the sum of its proper divisors (33321).

82031311 is a wasteful number, since it uses less digits than its factorization.

82031311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33320.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 82031311 is about 9057.1138338877. The cubic root of 82031311 is about 434.5034383124.

Adding to 82031311 its reverse (11313028), we get a palindrome (93344339).

It can be divided in two parts, 820 and 31311, that added together give a triangular number (32131 = T₂₅₃).

The spelling of 82031311 in words is "eighty-two million, thirty-one thousand, three hundred eleven".