82921181 has 12 divisors (see below), whose sum is σ = 99068508. Its totient is φ = 69152832.

The previous prime is 82921171. The next prime is 82921199. The reversal of 82921181 is 18112928.

It can be written as a sum of positive squares in 2 ways, for example, as 48511225 + 34409956 = 6965^2 + 5866^2 .

It is not a de Polignac number, because 82921181 - 2⁶ = 82921117 is a prime.

It is a super-2 number, since 2×82921181² = 13751844516869522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82921151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21056 + ... + 24681.

It is an arithmetic number, because the mean of its divisors is an integer number (8255709).

Almost surely, 2^82921181 is an apocalyptic number.

It is an amenable number.

82921181 is a deficient number, since it is larger than the sum of its proper divisors (16147327).

82921181 is a wasteful number, since it uses less digits than its factorization.

82921181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45788 (or 45781 counting only the distinct ones).

The product of its digits is 2304, while the sum is 32.

The square root of 82921181 is about 9106.1067970895. The cubic root of 82921181 is about 436.0689454839.

The spelling of 82921181 in words is "eighty-two million, nine hundred twenty-one thousand, one hundred eighty-one".