121517545 has 4 divisors (see below), whose sum is σ = 145821060. Its totient is φ = 97214032.

The previous prime is 121517507. The next prime is 121517549. The reversal of 121517545 is 545715121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22733824 + 98783721 = 4768^2 + 9939^2 .

It is a cyclic number.

It is not a de Polignac number, because 121517545 - 2¹¹ = 121515497 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (121517549) 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 3 ways as a sum of consecutive naturals, for example, 12151750 + ... + 12151759.

It is an arithmetic number, because the mean of its divisors is an integer number (36455265).

Almost surely, 2^121517545 is an apocalyptic number.

It is an amenable number.

121517545 is a deficient number, since it is larger than the sum of its proper divisors (24303515).

121517545 is an equidigital number, since it uses as much as digits as its factorization.

121517545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24303514.

The product of its digits is 7000, while the sum is 31.

The square root of 121517545 is about 11023.4996711571. The cubic root of 121517545 is about 495.3129266450.

The spelling of 121517545 in words is "one hundred twenty-one million, five hundred seventeen thousand, five hundred forty-five".