121217669 has 2 divisors, whose sum is σ = 121217670. Its totient is φ = 121217668.

The previous prime is 121217641. The next prime is 121217711. The reversal of 121217669 is 966712121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106853569 + 14364100 = 10337^2 + 3790^2 .

It is a cyclic number.

It is not a de Polignac number, because 121217669 - 2¹⁶ = 121152133 is a prime.

It is a super-2 number, since 2×121217669² = 29387446555587122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121217639) 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, 60608834 + 60608835.

It is an arithmetic number, because the mean of its divisors is an integer number (60608835).

Almost surely, 2^121217669 is an apocalyptic number.

It is an amenable number.

121217669 is a deficient number, since it is larger than the sum of its proper divisors (1).

121217669 is an equidigital number, since it uses as much as digits as its factorization.

121217669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 35.

The square root of 121217669 is about 11009.8895998098. The cubic root of 121217669 is about 494.9051534088.

It can be divided in two parts, 1212 and 17669, that added together give a palindrome (18881).

The spelling of 121217669 in words is "one hundred twenty-one million, two hundred seventeen thousand, six hundred sixty-nine".