161436073 has 4 divisors (see below), whose sum is σ = 164082628. Its totient is φ = 158789520.

The previous prime is 161436071. The next prime is 161436089. The reversal of 161436073 is 370634161.

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 67190809 + 94245264 = 8197^2 + 9708^2 .

It is a cyclic number.

It is not a de Polignac number, because 161436073 - 2¹ = 161436071 is a prime.

It is a super-2 number, since 2×161436073² = 52123211331322658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161436071) 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, 1323186 + ... + 1323307.

It is an arithmetic number, because the mean of its divisors is an integer number (41020657).

Almost surely, 2^161436073 is an apocalyptic number.

It is an amenable number.

161436073 is a deficient number, since it is larger than the sum of its proper divisors (2646555).

161436073 is an equidigital number, since it uses as much as digits as its factorization.

161436073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2646554.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 161436073 is about 12705.7496040179. The cubic root of 161436073 is about 544.5028971703.

The spelling of 161436073 in words is "one hundred sixty-one million, four hundred thirty-six thousand, seventy-three".