121641305 has 8 divisors (see below), whose sum is σ = 146039112. Its totient is φ = 97266688.

The previous prime is 121641293. The next prime is 121641323. The reversal of 121641305 is 503146121.

It can be written as a sum of positive squares in 4 ways, for example, as 81938704 + 39702601 = 9052^2 + 6301^2 .

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 121641305 - 2¹² = 121637209 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9347 + ... + 18183.

It is an arithmetic number, because the mean of its divisors is an integer number (18254889).

Almost surely, 2^121641305 is an apocalyptic number.

It is an amenable number.

121641305 is a deficient number, since it is larger than the sum of its proper divisors (24397807).

121641305 is an equidigital number, since it uses as much as digits as its factorization.

121641305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11595.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 121641305 is about 11029.1117049380. Note that the first 3 decimals coincide. The cubic root of 121641305 is about 495.4810206959.

Adding to 121641305 its reverse (503146121), we get a palindrome (624787426).

The spelling of 121641305 in words is "one hundred twenty-one million, six hundred forty-one thousand, three hundred five".