121751530749 has 24 divisors (see below), whose sum is σ = 177641956440. Its totient is φ = 80350627968.

The previous prime is 121751530741. The next prime is 121751530787. The reversal of 121751530749 is 947035157121.

121751530749 is a `hidden beast` number, since 1 + 2 + 1 + 75 + 1 + 530 + 7 + 49 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2695478724 + 119056052025 = 51918^2 + 345045^2 .

It is not a de Polignac number, because 121751530749 - 2³ = 121751530741 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121751530741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 219939 + ... + 540255.

It is an arithmetic number, because the mean of its divisors is an integer number (7401748185).

Almost surely, 2^121751530749 is an apocalyptic number.

It is an amenable number.

121751530749 is a deficient number, since it is larger than the sum of its proper divisors (55890425691).

121751530749 is a wasteful number, since it uses less digits than its factorization.

121751530749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320749 (or 320746 counting only the distinct ones).

The product of its (nonzero) digits is 264600, while the sum is 45.

The spelling of 121751530749 in words is "one hundred twenty-one billion, seven hundred fifty-one million, five hundred thirty thousand, seven hundred forty-nine".