121256549 has 2 divisors, whose sum is σ = 121256550. Its totient is φ = 121256548.

The previous prime is 121256543. The next prime is 121256561. The reversal of 121256549 is 945652121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102921025 + 18335524 = 10145^2 + 4282^2 .

It is a cyclic number.

It is not a de Polignac number, because 121256549 - 2⁸ = 121256293 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121256543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60628274 + 60628275.

It is an arithmetic number, because the mean of its divisors is an integer number (60628275).

Almost surely, 2^121256549 is an apocalyptic number.

It is an amenable number.

121256549 is a deficient number, since it is larger than the sum of its proper divisors (1).

121256549 is an equidigital number, since it uses as much as digits as its factorization.

121256549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 35.

The square root of 121256549 is about 11011.6551435286. The cubic root of 121256549 is about 494.9580605899.

The spelling of 121256549 in words is "one hundred twenty-one million, two hundred fifty-six thousand, five hundred forty-nine".