82491161 has 8 divisors (see below), whose sum is σ = 84270024. Its totient is φ = 80720640.

The previous prime is 82491121. The next prime is 82491193. The reversal of 82491161 is 16119428.

It can be written as a sum of positive squares in 4 ways, for example, as 697225 + 81793936 = 835^2 + 9044^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 82491161 - 2²² = 78296857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82491121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20465 + ... + 24161.

It is an arithmetic number, because the mean of its divisors is an integer number (10533753).

Almost surely, 2^82491161 is an apocalyptic number.

It is an amenable number.

82491161 is a deficient number, since it is larger than the sum of its proper divisors (1778863).

82491161 is a wasteful number, since it uses less digits than its factorization.

82491161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4171.

The product of its digits is 3456, while the sum is 32.

The square root of 82491161 is about 9082.4644783231. The cubic root of 82491161 is about 435.3138370279.

The spelling of 82491161 in words is "eighty-two million, four hundred ninety-one thousand, one hundred sixty-one".