161082091 has 2 divisors, whose sum is σ = 161082092. Its totient is φ = 161082090.

The previous prime is 161082049. The next prime is 161082121. The reversal of 161082091 is 190280161.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (190280161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161082091 - 2²⁷ = 26864363 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161082391) 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 as a sum of consecutive naturals, namely, 80541045 + 80541046.

It is an arithmetic number, because the mean of its divisors is an integer number (80541046).

Almost surely, 2^161082091 is an apocalyptic number.

161082091 is a deficient number, since it is larger than the sum of its proper divisors (1).

161082091 is an equidigital number, since it uses as much as digits as its factorization.

161082091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 161082091 is about 12691.8119667761. The cubic root of 161082091 is about 544.1046275022.

The spelling of 161082091 in words is "one hundred sixty-one million, eighty-two thousand, ninety-one".