121543453 has 2 divisors, whose sum is σ = 121543454.
Its totient is φ = 121543452.
The previous prime is 121543441. The next prime is 121543463. The reversal of 121543453 is 354345121.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 117787609 + 3755844 = 10853^2 + 1938^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-121543453 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (121543403) 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, 60771726 + 60771727.
It is an arithmetic number, because the mean of its divisors is an integer number (60771727).
Almost surely, 2121543453 is an apocalyptic number.
It is an amenable number.
121543453 is a deficient number, since it is larger than the sum of its proper divisors (1).
121543453 is an equidigital number, since it uses as much as digits as its factorization.
121543453 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 7200, while the sum is 28.
The square root of 121543453 is about 11024.6747344309.
The cubic root of 121543453 is about 495.3481250065.
Adding to 121543453 its reverse (354345121), we get a palindrome (475888574).
The spelling of 121543453 in words is "one hundred twenty-one million, five hundred forty-three thousand, four hundred fifty-three".