121544541 has 24 divisors (see below), whose sum is σ = 181916280. Its totient is φ = 78144000.

The previous prime is 121544537. The next prime is 121544557. The reversal of 121544541 is 145445121.

121544541 is a `hidden beast` number, since 1 + 215 + 445 + 4 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1313316 + 120231225 = 1146^2 + 10965^2 .

It is not a de Polignac number, because 121544541 - 2² = 121544537 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121544561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30991 + ... + 34691.

It is an arithmetic number, because the mean of its divisors is an integer number (7579845).

Almost surely, 2^121544541 is an apocalyptic number.

It is an amenable number.

121544541 is a deficient number, since it is larger than the sum of its proper divisors (60371739).

121544541 is a wasteful number, since it uses less digits than its factorization.

121544541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3837 (or 3834 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 121544541 is about 11024.7240781799. The cubic root of 121544541 is about 495.3496030435.

Adding to 121544541 its reverse (145445121), we get a palindrome (266989662).

The spelling of 121544541 in words is "one hundred twenty-one million, five hundred forty-four thousand, five hundred forty-one".