121541549 has 2 divisors, whose sum is σ = 121541550. Its totient is φ = 121541548.

The previous prime is 121541543. The next prime is 121541573. The reversal of 121541549 is 945145121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91489225 + 30052324 = 9565^2 + 5482^2 .

It is a cyclic number.

It is not a de Polignac number, because 121541549 - 2¹⁶ = 121476013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121541543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60770774 + 60770775.

It is an arithmetic number, because the mean of its divisors is an integer number (60770775).

Almost surely, 2^121541549 is an apocalyptic number.

It is an amenable number.

121541549 is a deficient number, since it is larger than the sum of its proper divisors (1).

121541549 is an equidigital number, since it uses as much as digits as its factorization.

121541549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 32.

The square root of 121541549 is about 11024.5883823388. The cubic root of 121541549 is about 495.3455384206.

The spelling of 121541549 in words is "one hundred twenty-one million, five hundred forty-one thousand, five hundred forty-nine".