121543451 has 4 divisors (see below), whose sum is σ = 121598400. Its totient is φ = 121488504.

The previous prime is 121543441. The next prime is 121543453. The reversal of 121543451 is 154345121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121543451 - 2²⁶ = 54434587 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121543451.

It is not an unprimeable number, because it can be changed into a prime (121543453) 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 in 3 ways as a sum of consecutive naturals, for example, 24011 + ... + 28628.

It is an arithmetic number, because the mean of its divisors is an integer number (30399600).

Almost surely, 2^121543451 is an apocalyptic number.

121543451 is a deficient number, since it is larger than the sum of its proper divisors (54949).

121543451 is an equidigital number, since it uses as much as digits as its factorization.

121543451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54948.

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

The square root of 121543451 is about 11024.6746437253. The cubic root of 121543451 is about 495.3481222895.

Adding to 121543451 its reverse (154345121), we get a palindrome (275888572).

The spelling of 121543451 in words is "one hundred twenty-one million, five hundred forty-three thousand, four hundred fifty-one".