161749585 has 8 divisors (see below), whose sum is σ = 194622120. Its totient is φ = 129051264.

The previous prime is 161749583. The next prime is 161749589. The reversal of 161749585 is 585947161.

It can be written as a sum of positive squares in 4 ways, for example, as 23357889 + 138391696 = 4833^2 + 11764^2 .

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 161749585 - 2¹ = 161749583 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161749583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41500 + ... + 45229.

It is an arithmetic number, because the mean of its divisors is an integer number (24327765).

Almost surely, 2^161749585 is an apocalyptic number.

It is an amenable number.

161749585 is a deficient number, since it is larger than the sum of its proper divisors (32872535).

161749585 is an equidigital number, since it uses as much as digits as its factorization.

161749585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87107.

The product of its digits is 302400, while the sum is 46.

The square root of 161749585 is about 12718.0810266329. The cubic root of 161749585 is about 544.8551476555.

The spelling of 161749585 in words is "one hundred sixty-one million, seven hundred forty-nine thousand, five hundred eighty-five".