82909181 has 4 divisors (see below), whose sum is σ = 86513952. Its totient is φ = 79304412.

The previous prime is 82909163. The next prime is 82909207. The reversal of 82909181 is 18190928.

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 82909181 - 2²² = 78714877 is a prime.

It is a super-2 number, since 2×82909181² = 13747864588181522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82909111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1802351 + ... + 1802396.

It is an arithmetic number, because the mean of its divisors is an integer number (21628488).

Almost surely, 2^82909181 is an apocalyptic number.

It is an amenable number.

82909181 is a deficient number, since it is larger than the sum of its proper divisors (3604771).

82909181 is a wasteful number, since it uses less digits than its factorization.

82909181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3604770.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 82909181 is about 9105.4478747616. The cubic root of 82909181 is about 436.0479091225.

It can be divided in two parts, 8290 and 9181, that added together give a palindrome (17471).

The spelling of 82909181 in words is "eighty-two million, nine hundred nine thousand, one hundred eighty-one".