122166181 has 4 divisors (see below), whose sum is σ = 128596000. Its totient is φ = 115736364.

The previous prime is 122166173. The next prime is 122166197. The reversal of 122166181 is 181661221.

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.

It is a cyclic number.

It is not a de Polignac number, because 122166181 - 2³ = 122166173 is a prime.

It is a super-2 number, since 2×122166181² = 29849151560249522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122167181) 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, 3214881 + ... + 3214918.

It is an arithmetic number, because the mean of its divisors is an integer number (32149000).

Almost surely, 2^122166181 is an apocalyptic number.

It is an amenable number.

122166181 is a deficient number, since it is larger than the sum of its proper divisors (6429819).

122166181 is an equidigital number, since it uses as much as digits as its factorization.

122166181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6429818.

The product of its digits is 1152, while the sum is 28.

The square root of 122166181 is about 11052.8811176091. The cubic root of 122166181 is about 496.1926565256.

The spelling of 122166181 in words is "one hundred twenty-two million, one hundred sixty-six thousand, one hundred eighty-one".