161344505 has 12 divisors (see below), whose sum is σ = 225224100. Its totient is φ = 110636064.

The previous prime is 161344493. The next prime is 161344511. The reversal of 161344505 is 505443161.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 51681721 + 109662784 = 7189^2 + 10472^2 .

It is not a de Polignac number, because 161344505 - 2²⁰ = 160295929 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 329030 + ... + 329519.

It is an arithmetic number, because the mean of its divisors is an integer number (18768675).

Almost surely, 2^161344505 is an apocalyptic number.

It is an amenable number.

161344505 is a deficient number, since it is larger than the sum of its proper divisors (63879595).

161344505 is an equidigital number, since it uses as much as digits as its factorization.

161344505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658568 (or 658561 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 161344505 is about 12702.1456848833. The cubic root of 161344505 is about 544.3999287111.

Adding to 161344505 its reverse (505443161), we get a palindrome (666787666).

The spelling of 161344505 in words is "one hundred sixty-one million, three hundred forty-four thousand, five hundred five".