121608769 has 4 divisors (see below), whose sum is σ = 128762244. Its totient is φ = 114455296.

The previous prime is 121608763. The next prime is 121608827. The reversal of 121608769 is 967806121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 967806121 = 23 ⋅42078527.

It can be written as a sum of positive squares in 2 ways, for example, as 79423744 + 42185025 = 8912^2 + 6495^2 .

It is a cyclic number.

It is not a de Polignac number, because 121608769 - 2³ = 121608761 is a prime.

It is a super-2 number, since 2×121608769² = 29577385395390722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121608761) 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, 3576712 + ... + 3576745.

It is an arithmetic number, because the mean of its divisors is an integer number (32190561).

Almost surely, 2^121608769 is an apocalyptic number.

It is an amenable number.

121608769 is a deficient number, since it is larger than the sum of its proper divisors (7153475).

121608769 is an equidigital number, since it uses as much as digits as its factorization.

121608769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7153474.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 121608769 is about 11027.6366008316. The cubic root of 121608769 is about 495.4368405056.

The spelling of 121608769 in words is "one hundred twenty-one million, six hundred eight thousand, seven hundred sixty-nine".