121255489 has 2 divisors, whose sum is σ = 121255490. Its totient is φ = 121255488.

The previous prime is 121255487. The next prime is 121255493. The reversal of 121255489 is 984552121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69889600 + 51365889 = 8360^2 + 7167^2 .

It is a cyclic number.

It is not a de Polignac number, because 121255489 - 2¹ = 121255487 is a prime.

It is a super-2 number, since 2×121255489² = 29405787225258242, which contains 22 as substring.

Together with 121255487, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (121255487) 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, 60627744 + 60627745.

It is an arithmetic number, because the mean of its divisors is an integer number (60627745).

Almost surely, 2^121255489 is an apocalyptic number.

It is an amenable number.

121255489 is a deficient number, since it is larger than the sum of its proper divisors (1).

121255489 is an equidigital number, since it uses as much as digits as its factorization.

121255489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 37.

The square root of 121255489 is about 11011.6070126027. The cubic root of 121255489 is about 494.9566183115.

The spelling of 121255489 in words is "one hundred twenty-one million, two hundred fifty-five thousand, four hundred eighty-nine".