121317565 has 16 divisors (see below), whose sum is σ = 156985920. Its totient is φ = 89700480.

The previous prime is 121317557. The next prime is 121317569. The reversal of 121317565 is 565713121.

It is not a de Polignac number, because 121317565 - 2³ = 121317557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121317569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11679 + ... + 19468.

It is an arithmetic number, because the mean of its divisors is an integer number (9811620).

Almost surely, 2^121317565 is an apocalyptic number.

It is an amenable number.

121317565 is a deficient number, since it is larger than the sum of its proper divisors (35668355).

121317565 is a wasteful number, since it uses less digits than its factorization.

121317565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31212.

The product of its digits is 6300, while the sum is 31.

The square root of 121317565 is about 11014.4253141051. The cubic root of 121317565 is about 495.0410672319.

The spelling of 121317565 in words is "one hundred twenty-one million, three hundred seventeen thousand, five hundred sixty-five".