121705313 has 4 divisors (see below), whose sum is σ = 121739268. Its totient is φ = 121671360.

The previous prime is 121705291. The next prime is 121705319. The reversal of 121705313 is 313507121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 313507121 = 61 ⋅5139461.

It can be written as a sum of positive squares in 2 ways, for example, as 13191424 + 108513889 = 3632^2 + 10417^2 .

It is a cyclic number.

It is not a de Polignac number, because 121705313 - 2²⁰ = 120656737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121705319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10868 + ... + 19013.

It is an arithmetic number, because the mean of its divisors is an integer number (30434817).

Almost surely, 2^121705313 is an apocalyptic number.

It is an amenable number.

121705313 is a deficient number, since it is larger than the sum of its proper divisors (33955).

121705313 is an equidigital number, since it uses as much as digits as its factorization.

121705313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33954.

The product of its (nonzero) digits is 630, while the sum is 23.

The square root of 121705313 is about 11032.0130982518. The cubic root of 121705313 is about 495.5679132965.

The spelling of 121705313 in words is "one hundred twenty-one million, seven hundred five thousand, three hundred thirteen".