306121 has 2 divisors, whose sum is σ = 306122. Its totient is φ = 306120.

The previous prime is 306091. The next prime is 306133. The reversal of 306121 is 121603.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 270400 + 35721 = 520^2 + 189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-306121 is a prime.

306121 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (306191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153060 + 153061.

It is an arithmetic number, because the mean of its divisors is an integer number (153061).

2³⁰⁶¹²¹ is an apocalyptic number.

It is an amenable number.

306121 is a deficient number, since it is larger than the sum of its proper divisors (1).

306121 is an equidigital number, since it uses as much as digits as its factorization.

306121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 306121 is about 553.2820257337. The cubic root of 306121 is about 67.3955219547.

Adding to 306121 its reverse (121603), we get a palindrome (427724).

The spelling of 306121 in words is "three hundred six thousand, one hundred twenty-one".