121153543 has 8 divisors (see below), whose sum is σ = 146606112. Its totient is φ = 97737216.

The previous prime is 121153541. The next prime is 121153553. The reversal of 121153543 is 345351121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121153543 - 2¹ = 121153541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121153541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 508930 + ... + 509167.

It is an arithmetic number, because the mean of its divisors is an integer number (18325764).

Almost surely, 2^121153543 is an apocalyptic number.

121153543 is a deficient number, since it is larger than the sum of its proper divisors (25452569).

121153543 is a wasteful number, since it uses less digits than its factorization.

121153543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018121.

The product of its digits is 1800, while the sum is 25.

The square root of 121153543 is about 11006.9770146031. The cubic root of 121153543 is about 494.8178672178.

It can be divided in two parts, 121 and 153543, that added together give a square (153664 = 392²).

The spelling of 121153543 in words is "one hundred twenty-one million, one hundred fifty-three thousand, five hundred forty-three".