161144011 has 4 divisors (see below), whose sum is σ = 184164592. Its totient is φ = 138123432.

The previous prime is 161143979. The next prime is 161144041. The reversal of 161144011 is 110441161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110441161 = 1583 ⋅69767.

It is a cyclic number.

It is not a de Polignac number, because 161144011 - 2⁵ = 161143979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161144011.

It is not an unprimeable number, because it can be changed into a prime (161144041) 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, 11510280 + ... + 11510293.

It is an arithmetic number, because the mean of its divisors is an integer number (46041148).

Almost surely, 2^161144011 is an apocalyptic number.

161144011 is a deficient number, since it is larger than the sum of its proper divisors (23020581).

161144011 is an equidigital number, since it uses as much as digits as its factorization.

161144011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23020580.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 161144011 is about 12694.2511003997. The cubic root of 161144011 is about 544.1743365603.

Adding to 161144011 its reverse (110441161), we get a palindrome (271585172).

The spelling of 161144011 in words is "one hundred sixty-one million, one hundred forty-four thousand, eleven".