82691181 has 12 divisors (see below), whose sum is σ = 120603808. Its totient is φ = 54591624.

The previous prime is 82691159. The next prime is 82691221. The reversal of 82691181 is 18119628.

It is not a de Polignac number, because 82691181 - 2⁵ = 82691149 is a prime.

It is a super-2 number, since 2×82691181² = 13675662830349522, 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 (82691101) 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, 43675 + ... + 45528.

Almost surely, 2^82691181 is an apocalyptic number.

It is an amenable number.

82691181 is a deficient number, since it is larger than the sum of its proper divisors (37912627).

82691181 is a wasteful number, since it uses less digits than its factorization.

82691181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89312 (or 89309 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 82691181 is about 9093.4691399927. The cubic root of 82691181 is about 435.6653946652.

The spelling of 82691181 in words is "eighty-two million, six hundred ninety-one thousand, one hundred eighty-one".