121923543 has 16 divisors (see below), whose sum is σ = 188407296. Its totient is φ = 68688480.

The previous prime is 121923539. The next prime is 121923577. The reversal of 121923543 is 345329121.

It is not a de Polignac number, because 121923543 - 2² = 121923539 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121923543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121923583) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39396 + ... + 42377.

It is an arithmetic number, because the mean of its divisors is an integer number (11775456).

Almost surely, 2^121923543 is an apocalyptic number.

121923543 is a deficient number, since it is larger than the sum of its proper divisors (66483753).

121923543 is an equidigital number, since it uses as much as digits as its factorization.

121923543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81854.

The product of its digits is 6480, while the sum is 30.

The square root of 121923543 is about 11041.8994289932. The cubic root of 121923543 is about 495.8639376507.

The spelling of 121923543 in words is "one hundred twenty-one million, nine hundred twenty-three thousand, five hundred forty-three".