161110121 has 4 divisors (see below), whose sum is σ = 164856912. Its totient is φ = 157363332.

The previous prime is 161110073. The next prime is 161110153. The reversal of 161110121 is 121011161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 121011161 = 241 ⋅502121.

It is a cyclic number.

It is not a de Polignac number, because 161110121 - 2²² = 156915817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 161110096 and 161110105.

It is not an unprimeable number, because it can be changed into a prime (161110021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1873331 + ... + 1873416.

It is an arithmetic number, because the mean of its divisors is an integer number (41214228).

Almost surely, 2^161110121 is an apocalyptic number.

It is an amenable number.

161110121 is a deficient number, since it is larger than the sum of its proper divisors (3746791).

161110121 is an equidigital number, since it uses as much as digits as its factorization.

161110121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3746790.

The product of its (nonzero) digits is 12, while the sum is 14.

The square root of 161110121 is about 12692.9161739925. The cubic root of 161110121 is about 544.1361856725.

Adding to 161110121 its reverse (121011161), we get a palindrome (282121282).

The spelling of 161110121 in words is "one hundred sixty-one million, one hundred ten thousand, one hundred twenty-one".