161284505 has 8 divisors (see below), whose sum is σ = 193628232. Its totient is φ = 128969728.

The previous prime is 161284489. The next prime is 161284531. The reversal of 161284505 is 505482161.

It can be written as a sum of positive squares in 4 ways, for example, as 7722841 + 153561664 = 2779^2 + 12392^2 .

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 161284505 - 2⁴ = 161284489 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7907 + ... + 19623.

It is an arithmetic number, because the mean of its divisors is an integer number (24203529).

Almost surely, 2^161284505 is an apocalyptic number.

It is an amenable number.

161284505 is a deficient number, since it is larger than the sum of its proper divisors (32343727).

161284505 is a wasteful number, since it uses less digits than its factorization.

161284505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14475.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 161284505 is about 12699.7836595747. The cubic root of 161284505 is about 544.3324374227.

The spelling of 161284505 in words is "one hundred sixty-one million, two hundred eighty-four thousand, five hundred five".