121320289 has 2 divisors, whose sum is σ = 121320290. Its totient is φ = 121320288.

The previous prime is 121320257. The next prime is 121320319. The reversal of 121320289 is 982023121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67371264 + 53949025 = 8208^2 + 7345^2 .

It is a cyclic number.

It is not a de Polignac number, because 121320289 - 2⁵ = 121320257 is a prime.

It is a super-2 number, since 2×121320289² = 29437225046087042, which contains 22 as substring.

It is equal to p_6912505 and since 121320289 and 6912505 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (121320389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60660144 + 60660145.

It is an arithmetic number, because the mean of its divisors is an integer number (60660145).

Almost surely, 2^121320289 is an apocalyptic number.

It is an amenable number.

121320289 is a deficient number, since it is larger than the sum of its proper divisors (1).

121320289 is an equidigital number, since it uses as much as digits as its factorization.

121320289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 121320289 is about 11014.5489694313. The cubic root of 121320289 is about 495.0447723336.

The spelling of 121320289 in words is "one hundred twenty-one million, three hundred twenty thousand, two hundred eighty-nine".