121455543 has 32 divisors (see below), whose sum is σ = 187971840. Its totient is φ = 68981760.

The previous prime is 121455527. The next prime is 121455547. The reversal of 121455543 is 345554121.

It is not a de Polignac number, because 121455543 - 2⁴ = 121455527 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121455543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121455547) 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 31 ways as a sum of consecutive naturals, for example, 59821 + ... + 61817.

It is an arithmetic number, because the mean of its divisors is an integer number (5874120).

Almost surely, 2^121455543 is an apocalyptic number.

121455543 is a deficient number, since it is larger than the sum of its proper divisors (66516297).

121455543 is a wasteful number, since it uses less digits than its factorization.

121455543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2127.

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

The square root of 121455543 is about 11020.6870475484. The cubic root of 121455543 is about 495.2286710020.

The spelling of 121455543 in words is "one hundred twenty-one million, four hundred fifty-five thousand, five hundred forty-three".