122256161 has 4 divisors (see below), whose sum is σ = 122289300. Its totient is φ = 122223024.

The previous prime is 122256151. The next prime is 122256179. The reversal of 122256161 is 161652221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161652221 = 4663 ⋅34667.

It can be written as a sum of positive squares in 2 ways, for example, as 121969936 + 286225 = 11044^2 + 535^2 .

It is a cyclic number.

It is not a de Polignac number, because 122256161 - 2¹⁰ = 122255137 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 122256161.

It is not an unprimeable number, because it can be changed into a prime (122256131) 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, 10226 + ... + 18683.

It is an arithmetic number, because the mean of its divisors is an integer number (30572325).

Almost surely, 2^122256161 is an apocalyptic number.

It is an amenable number.

122256161 is a deficient number, since it is larger than the sum of its proper divisors (33139).

122256161 is an equidigital number, since it uses as much as digits as its factorization.

122256161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33138.

The product of its digits is 1440, while the sum is 26.

The square root of 122256161 is about 11056.9508002885. The cubic root of 122256161 is about 496.3144481646.

The spelling of 122256161 in words is "one hundred twenty-two million, two hundred fifty-six thousand, one hundred sixty-one".