121045543 has 2 divisors, whose sum is σ = 121045544. Its totient is φ = 121045542.

The previous prime is 121045541. The next prime is 121045567. The reversal of 121045543 is 345540121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121045543 - 2¹ = 121045541 is a prime.

Together with 121045541, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121045541) 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, 60522771 + 60522772.

It is an arithmetic number, because the mean of its divisors is an integer number (60522772).

Almost surely, 2^121045543 is an apocalyptic number.

121045543 is a deficient number, since it is larger than the sum of its proper divisors (1).

121045543 is an equidigital number, since it uses as much as digits as its factorization.

121045543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 121045543 is about 11002.0699416064. The cubic root of 121045543 is about 494.6707915438.

Adding to 121045543 its reverse (345540121), we get a palindrome (466585664).

The spelling of 121045543 in words is "one hundred twenty-one million, forty-five thousand, five hundred forty-three".