305865121 has 3 divisors (see below), whose sum is σ = 305882611. Its totient is φ = 305847632.

The previous prime is 305865107. The next prime is 305865167. The reversal of 305865121 is 121568503.

The square root of 305865121 is 17489.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 314721 + 305550400 = 561^2 + 17480^2 .

It is not a de Polignac number, because 305865121 - 2¹⁷ = 305734049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (305865181) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 8745 + ... + 26233.

Almost surely, 2^305865121 is an apocalyptic number.

305865121 is the 17489-th square number.

305865121 is the 8745-th centered octagonal number.

It is an amenable number.

305865121 is a deficient number, since it is larger than the sum of its proper divisors (17490).

305865121 is an frugal number, since it uses more digits than its factorization.

305865121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34978 (or 17489 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

The cubic root of 305865121 is about 673.7673863495.

The spelling of 305865121 in words is "three hundred five million, eight hundred sixty-five thousand, one hundred twenty-one".