121715565 has 8 divisors (see below), whose sum is σ = 194744928. Its totient is φ = 64914960.

The previous prime is 121715551. The next prime is 121715569. The reversal of 121715565 is 565517121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121715565 - 2²⁰ = 120666989 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121715569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4057171 + ... + 4057200.

It is an arithmetic number, because the mean of its divisors is an integer number (24343116).

Almost surely, 2^121715565 is an apocalyptic number.

121715565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121715565 is a deficient number, since it is larger than the sum of its proper divisors (73029363).

121715565 is an equidigital number, since it uses as much as digits as its factorization.

121715565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8114379.

The product of its digits is 10500, while the sum is 33.

The square root of 121715565 is about 11032.4777362114. The cubic root of 121715565 is about 495.5818278345.

The spelling of 121715565 in words is "one hundred twenty-one million, seven hundred fifteen thousand, five hundred sixty-five".