121751535537 has 40 divisors (see below), whose sum is σ = 187220717376. Its totient is φ = 78804962208.

The previous prime is 121751535523. The next prime is 121751535571. The reversal of 121751535537 is 735535157121.

121751535537 is a `hidden beast` number, since 1 + 2 + 1 + 75 + 15 + 35 + 537 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-121751535537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121751535492 and 121751535501.

It is not an unprimeable number, because it can be changed into a prime (121751535137) 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 39 ways as a sum of consecutive naturals, for example, 477003 + ... + 686319.

Almost surely, 2^121751535537 is an apocalyptic number.

It is an amenable number.

121751535537 is a deficient number, since it is larger than the sum of its proper divisors (65469181839).

121751535537 is a wasteful number, since it uses less digits than its factorization.

121751535537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209539 (or 209530 counting only the distinct ones).

The product of its digits is 551250, while the sum is 45.

The spelling of 121751535537 in words is "one hundred twenty-one billion, seven hundred fifty-one million, five hundred thirty-five thousand, five hundred thirty-seven".