121506563 has 2 divisors, whose sum is σ = 121506564. Its totient is φ = 121506562.

The previous prime is 121506521. The next prime is 121506569. The reversal of 121506563 is 365605121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121506563 - 2¹⁸ = 121244419 is a prime.

It is not a weakly prime, because it can be changed into another prime (121506569) 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, 60753281 + 60753282.

It is an arithmetic number, because the mean of its divisors is an integer number (60753282).

Almost surely, 2^121506563 is an apocalyptic number.

121506563 is a deficient number, since it is larger than the sum of its proper divisors (1).

121506563 is an equidigital number, since it uses as much as digits as its factorization.

121506563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 121506563 is about 11023.0015422298. The cubic root of 121506563 is about 495.2980050948.

The spelling of 121506563 in words is "one hundred twenty-one million, five hundred six thousand, five hundred sixty-three".