161072201 has 4 divisors (see below), whose sum is σ = 161763732. Its totient is φ = 160380672.

The previous prime is 161072167. The next prime is 161072209. The reversal of 161072201 is 102270161.

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 96510976 + 64561225 = 9824^2 + 8035^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161072201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161072209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345416 + ... + 345881.

It is an arithmetic number, because the mean of its divisors is an integer number (40440933).

Almost surely, 2^161072201 is an apocalyptic number.

It is an amenable number.

161072201 is a deficient number, since it is larger than the sum of its proper divisors (691531).

161072201 is an equidigital number, since it uses as much as digits as its factorization.

161072201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691530.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 161072201 is about 12691.4223395173. The cubic root of 161072201 is about 544.0934917621.

The spelling of 161072201 in words is "one hundred sixty-one million, seventy-two thousand, two hundred one".