161353505 has 4 divisors (see below), whose sum is σ = 193624212. Its totient is φ = 129082800.

The previous prime is 161353499. The next prime is 161353589. The reversal of 161353505 is 505353161.

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 120802081 + 40551424 = 10991^2 + 6368^2 .

It is not a de Polignac number, because 161353505 - 2⁸ = 161353249 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 16135346 + ... + 16135355.

It is an arithmetic number, because the mean of its divisors is an integer number (48406053).

Almost surely, 2^161353505 is an apocalyptic number.

It is an amenable number.

161353505 is a deficient number, since it is larger than the sum of its proper divisors (32270707).

161353505 is an equidigital number, since it uses as much as digits as its factorization.

161353505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32270706.

The product of its (nonzero) digits is 6750, while the sum is 29.

The square root of 161353505 is about 12702.4999507971. The cubic root of 161353505 is about 544.4100509611.

The spelling of 161353505 in words is "one hundred sixty-one million, three hundred fifty-three thousand, five hundred five".