121544541531 has 12 divisors (see below), whose sum is σ = 200644957552. Its totient is φ = 69454023696.

The previous prime is 121544541529. The next prime is 121544541539. The reversal of 121544541531 is 135145445121.

121544541531 is a `hidden beast` number, since 1 + 2 + 1 + 54 + 454 + 153 + 1 = 666.

It is not a de Polignac number, because 121544541531 - 2¹ = 121544541529 is a prime.

It is a super-2 number, since 2×121544541531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121544541539) 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 11 ways as a sum of consecutive naturals, for example, 964639156 + ... + 964639281.

Almost surely, 2^121544541531 is an apocalyptic number.

121544541531 is a deficient number, since it is larger than the sum of its proper divisors (79100416021).

121544541531 is a wasteful number, since it uses less digits than its factorization.

121544541531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1929278450 (or 1929278447 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

Adding to 121544541531 its reverse (135145445121), we get a palindrome (256689986652).

The spelling of 121544541531 in words is "one hundred twenty-one billion, five hundred forty-four million, five hundred forty-one thousand, five hundred thirty-one".