161310505 has 8 divisors (see below), whose sum is σ = 194761152. Its totient is φ = 128256048.

The previous prime is 161310503. The next prime is 161310521. The reversal of 161310505 is 505013161.

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 161310505 - 2¹ = 161310503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161310503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98149 + ... + 99778.

It is an arithmetic number, because the mean of its divisors is an integer number (24345144).

Almost surely, 2^161310505 is an apocalyptic number.

It is an amenable number.

161310505 is a deficient number, since it is larger than the sum of its proper divisors (33450647).

161310505 is a wasteful number, since it uses less digits than its factorization.

161310505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198095.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 161310505 is about 12700.8072578085. The cubic root of 161310505 is about 544.3616857024.

Adding to 161310505 its reverse (505013161), we get a palindrome (666323666).

The spelling of 161310505 in words is "one hundred sixty-one million, three hundred ten thousand, five hundred five".