122811161 has 4 divisors (see below), whose sum is σ = 133975824. Its totient is φ = 111646500.

The previous prime is 122811151. The next prime is 122811163. The reversal of 122811161 is 161118221.

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: 161118221 = 11 ⋅14647111.

It is a cyclic number.

It is not a de Polignac number, because 122811161 - 2¹⁰ = 122810137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122811163) 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, 5582315 + ... + 5582336.

It is an arithmetic number, because the mean of its divisors is an integer number (33493956).

Almost surely, 2^122811161 is an apocalyptic number.

122811161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

122811161 is a deficient number, since it is larger than the sum of its proper divisors (11164663).

122811161 is a wasteful number, since it uses less digits than its factorization.

122811161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11164662.

The product of its digits is 192, while the sum is 23.

The square root of 122811161 is about 11082.0197166401. The cubic root of 122811161 is about 497.0643455994.

Adding to 122811161 its reverse (161118221), we get a palindrome (283929382).

The spelling of 122811161 in words is "one hundred twenty-two million, eight hundred eleven thousand, one hundred sixty-one".