161201705 has 16 divisors (see below), whose sum is σ = 228209664. Its totient is φ = 106971840.

The previous prime is 161201699. The next prime is 161201707. The reversal of 161201705 is 507102161.

It is not a de Polignac number, because 161201705 - 2²⁰ = 160153129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161201707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73202 + ... + 75371.

It is an arithmetic number, because the mean of its divisors is an integer number (14263104).

Almost surely, 2^161201705 is an apocalyptic number.

It is an amenable number.

161201705 is a deficient number, since it is larger than the sum of its proper divisors (67007959).

161201705 is a wasteful number, since it uses less digits than its factorization.

161201705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148616.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 161201705 is about 12696.5233430258. The cubic root of 161201705 is about 544.2392719513.

Adding to 161201705 its reverse (507102161), we get a palindrome (668303866).

The spelling of 161201705 in words is "one hundred sixty-one million, two hundred one thousand, seven hundred five".