121500513 has 48 divisors (see below), whose sum is σ = 199820160. Its totient is φ = 72813312.

The previous prime is 121500493. The next prime is 121500521. The reversal of 121500513 is 315005121.

121500513 is a `hidden beast` number, since 1 + 2 + 150 + 0 + 513 = 666.

It is not a de Polignac number, because 121500513 - 2⁵ = 121500481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121500523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 179131 + ... + 179807.

It is an arithmetic number, because the mean of its divisors is an integer number (4162920).

Almost surely, 2^121500513 is an apocalyptic number.

It is an amenable number.

121500513 is a deficient number, since it is larger than the sum of its proper divisors (78319647).

121500513 is a wasteful number, since it uses less digits than its factorization.

121500513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743 (or 720 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 121500513 is about 11022.7271126523. The cubic root of 121500513 is about 495.2897844067.

Adding to 121500513 its reverse (315005121), we get a palindrome (436505634).

The spelling of 121500513 in words is "one hundred twenty-one million, five hundred thousand, five hundred thirteen".