121541543 has 2 divisors, whose sum is σ = 121541544. Its totient is φ = 121541542.

The previous prime is 121541509. The next prime is 121541549. The reversal of 121541543 is 345145121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121541543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121541549) 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, 60770771 + 60770772.

It is an arithmetic number, because the mean of its divisors is an integer number (60770772).

Almost surely, 2^121541543 is an apocalyptic number.

121541543 is a deficient number, since it is larger than the sum of its proper divisors (1).

121541543 is an equidigital number, since it uses as much as digits as its factorization.

121541543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 26.

The square root of 121541543 is about 11024.5881102198. The cubic root of 121541543 is about 495.3455302695.

Adding to 121541543 its reverse (345145121), we get a palindrome (466686664).

The spelling of 121541543 in words is "one hundred twenty-one million, five hundred forty-one thousand, five hundred forty-three".