121289 has 4 divisors (see below), whose sum is σ = 138624. Its totient is φ = 103956.

The previous prime is 121283. The next prime is 121291. The reversal of 121289 is 982121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121289 - 2¹² = 117193 is a prime.

It is a super-2 number, since 2×121289² = 29422043042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121283) 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, 8657 + ... + 8670.

It is an arithmetic number, because the mean of its divisors is an integer number (34656).

2¹²¹²⁸⁹ is an apocalyptic number.

It is an amenable number.

121289 is a deficient number, since it is larger than the sum of its proper divisors (17335).

121289 is an equidigital number, since it uses as much as digits as its factorization.

121289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17334.

The product of its digits is 288, while the sum is 23.

The square root of 121289 is about 348.2657031635. The cubic root of 121289 is about 49.5002210649.

It can be divided in two parts, 121 and 289, that multiplied together give a square (34969 = 187²).

The spelling of 121289 in words is "one hundred twenty-one thousand, two hundred eighty-nine".