161791073 has 4 divisors (see below), whose sum is σ = 162213888. Its totient is φ = 161368260.

The previous prime is 161791067. The next prime is 161791117. The reversal of 161791073 is 370197161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161791073 - 2¹⁸ = 161528929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161791373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210833 + ... + 211598.

It is an arithmetic number, because the mean of its divisors is an integer number (40553472).

Almost surely, 2^161791073 is an apocalyptic number.

It is an amenable number.

161791073 is a deficient number, since it is larger than the sum of its proper divisors (422815).

161791073 is an equidigital number, since it uses as much as digits as its factorization.

161791073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422814.

The product of its (nonzero) digits is 7938, while the sum is 35.

The square root of 161791073 is about 12719.7119857330. The cubic root of 161791073 is about 544.9017279254.

The spelling of 161791073 in words is "one hundred sixty-one million, seven hundred ninety-one thousand, seventy-three".