161103611 has 4 divisors (see below), whose sum is σ = 170580312. Its totient is φ = 151626912.

The previous prime is 161103583. The next prime is 161103619. The reversal of 161103611 is 116301161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 116301161 = 139 ⋅836699.

It is a cyclic number.

It is not a de Polignac number, because 161103611 - 2¹⁰ = 161102587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161103619) 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, 4738325 + ... + 4738358.

It is an arithmetic number, because the mean of its divisors is an integer number (42645078).

Almost surely, 2^161103611 is an apocalyptic number.

161103611 is a deficient number, since it is larger than the sum of its proper divisors (9476701).

161103611 is an equidigital number, since it uses as much as digits as its factorization.

161103611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9476700.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 161103611 is about 12692.6597291505. The cubic root of 161103611 is about 544.1288565772.

Adding to 161103611 its reverse (116301161), we get a palindrome (277404772).

The spelling of 161103611 in words is "one hundred sixty-one million, one hundred three thousand, six hundred eleven".