121535565 has 32 divisors (see below), whose sum is σ = 208417536. Its totient is φ = 60318720.

The previous prime is 121535551. The next prime is 121535569. The reversal of 121535565 is 565535121.

It is not a de Polignac number, because 121535565 - 2⁹ = 121535053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121535569) 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 31 ways as a sum of consecutive naturals, for example, 8005 + ... + 17525.

It is an arithmetic number, because the mean of its divisors is an integer number (6513048).

Almost surely, 2^121535565 is an apocalyptic number.

121535565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121535565 is a deficient number, since it is larger than the sum of its proper divisors (86881971).

121535565 is a wasteful number, since it uses less digits than its factorization.

121535565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9589.

The product of its digits is 22500, while the sum is 33.

The square root of 121535565 is about 11024.3169856459. The cubic root of 121535565 is about 495.3374089746.

The spelling of 121535565 in words is "one hundred twenty-one million, five hundred thirty-five thousand, five hundred sixty-five".