161320885 has 16 divisors (see below), whose sum is σ = 211715712. Its totient is φ = 117028800.

The previous prime is 161320879. The next prime is 161320909. The reversal of 161320885 is 588023161.

It is not a de Polignac number, because 161320885 - 2¹³ = 161312693 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161320885.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 19672 + ... + 26638.

It is an arithmetic number, because the mean of its divisors is an integer number (13232232).

Almost surely, 2^161320885 is an apocalyptic number.

It is an amenable number.

161320885 is a deficient number, since it is larger than the sum of its proper divisors (50394827).

161320885 is a wasteful number, since it uses less digits than its factorization.

161320885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7404.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 161320885 is about 12701.2158866779. The cubic root of 161320885 is about 544.3733616378.

The spelling of 161320885 in words is "one hundred sixty-one million, three hundred twenty thousand, eight hundred eighty-five".