1220121169 has 2 divisors, whose sum is σ = 1220121170. Its totient is φ = 1220121168.

The previous prime is 1220121167. The next prime is 1220121247. The reversal of 1220121169 is 9611210221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1058526225 + 161594944 = 32535^2 + 12712^2 .

It is an emirp because it is prime and its reverse (9611210221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1220121169 - 2¹ = 1220121167 is a prime.

It is a super-2 number, since 2×1220121169² = 2977391334083853122, which contains 22 as substring.

Together with 1220121167, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1220121163) 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 as a sum of consecutive naturals, namely, 610060584 + 610060585.

It is an arithmetic number, because the mean of its divisors is an integer number (610060585).

Almost surely, 2^1220121169 is an apocalyptic number.

It is an amenable number.

1220121169 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220121169 is an equidigital number, since it uses as much as digits as its factorization.

1220121169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 1220121169 is about 34930.2328792695. The cubic root of 1220121169 is about 1068.5651040267.

The spelling of 1220121169 in words is "one billion, two hundred twenty million, one hundred twenty-one thousand, one hundred sixty-nine".