121317505 has 8 divisors (see below), whose sum is σ = 145902312. Its totient is φ = 96839808.

The previous prime is 121317437. The next prime is 121317509. The reversal of 121317505 is 505713121.

It can be written as a sum of positive squares in 4 ways, for example, as 46131264 + 75186241 = 6792^2 + 8671^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 121317505 - 2²³ = 112928897 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121317505.

It is not an unprimeable number, because it can be changed into a prime (121317509) 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, 24262 + ... + 28831.

It is an arithmetic number, because the mean of its divisors is an integer number (18237789).

Almost surely, 2^121317505 is an apocalyptic number.

It is an amenable number.

121317505 is a deficient number, since it is larger than the sum of its proper divisors (24584807).

121317505 is an equidigital number, since it uses as much as digits as its factorization.

121317505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53555.

The product of its (nonzero) digits is 1050, while the sum is 25.

The square root of 121317505 is about 11014.4225904039. The cubic root of 121317505 is about 495.0409856211.

The spelling of 121317505 in words is "one hundred twenty-one million, three hundred seventeen thousand, five hundred five".