121288569 has 8 divisors (see below), whose sum is σ = 161784672. Its totient is φ = 80825760.

The previous prime is 121288567. The next prime is 121288633. The reversal of 121288569 is 965882121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121288569 - 2¹ = 121288567 is a prime.

It is a super-2 number, since 2×121288569² = 29421833940135522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 121288569.

It is not an unprimeable number, because it can be changed into a prime (121288567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2014 + ... + 15704.

It is an arithmetic number, because the mean of its divisors is an integer number (20223084).

Almost surely, 2^121288569 is an apocalyptic number.

It is an amenable number.

121288569 is a deficient number, since it is larger than the sum of its proper divisors (40496103).

121288569 is a wasteful number, since it uses less digits than its factorization.

121288569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16647.

The product of its digits is 69120, while the sum is 42.

The square root of 121288569 is about 11013.1089615966. The cubic root of 121288569 is about 495.0016243187.

The spelling of 121288569 in words is "one hundred twenty-one million, two hundred eighty-eight thousand, five hundred sixty-nine".