82161097 has 4 divisors (see below), whose sum is σ = 82356676. Its totient is φ = 81965520.

The previous prime is 82161071. The next prime is 82161109. The reversal of 82161097 is 79016128.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39075001 + 43086096 = 6251^2 + 6564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82161097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82161197) 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, 97158 + ... + 97999.

It is an arithmetic number, because the mean of its divisors is an integer number (20589169).

Almost surely, 2^82161097 is an apocalyptic number.

It is an amenable number.

82161097 is a deficient number, since it is larger than the sum of its proper divisors (195579).

82161097 is a wasteful number, since it uses less digits than its factorization.

82161097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195578.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 82161097 is about 9064.2758673818. The cubic root of 82161097 is about 434.7324677249.

The spelling of 82161097 in words is "eighty-two million, one hundred sixty-one thousand, ninety-seven".