121555547 has 2 divisors, whose sum is σ = 121555548. Its totient is φ = 121555546.

The previous prime is 121555537. The next prime is 121555561. The reversal of 121555547 is 745555121.

It is a weak prime.

It is an emirp because it is prime and its reverse (745555121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121555547 - 2¹⁴ = 121539163 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121555537) 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, 60777773 + 60777774.

It is an arithmetic number, because the mean of its divisors is an integer number (60777774).

Almost surely, 2^121555547 is an apocalyptic number.

121555547 is a deficient number, since it is larger than the sum of its proper divisors (1).

121555547 is an equidigital number, since it uses as much as digits as its factorization.

121555547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35000, while the sum is 35.

The square root of 121555547 is about 11025.2232176950. The cubic root of 121555547 is about 495.3645540870.

The spelling of 121555547 in words is "one hundred twenty-one million, five hundred fifty-five thousand, five hundred forty-seven".