121554543 has 12 divisors (see below), whose sum is σ = 178146584. Its totient is φ = 73669200.

The previous prime is 121554541. The next prime is 121554569. The reversal of 121554543 is 345455121.

It is not a de Polignac number, because 121554543 - 2¹ = 121554541 is a prime.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 121554543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121554541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 167068 + ... + 167793.

Almost surely, 2^121554543 is an apocalyptic number.

121554543 is a deficient number, since it is larger than the sum of its proper divisors (56592041).

121554543 is a wasteful number, since it uses less digits than its factorization.

121554543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334886 (or 334875 counting only the distinct ones).

The product of its digits is 12000, while the sum is 30.

The square root of 121554543 is about 11025.1776856430. The cubic root of 121554543 is about 495.3631902458.

The spelling of 121554543 in words is "one hundred twenty-one million, five hundred fifty-four thousand, five hundred forty-three".