1305621241 has 2 divisors, whose sum is σ = 1305621242. Its totient is φ = 1305621240.

The previous prime is 1305621227. The next prime is 1305621253. The reversal of 1305621241 is 1421265031.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1064129641 + 241491600 = 32621^2 + 15540^2 .

It is a cyclic number.

It is not a de Polignac number, because 1305621241 - 2¹⁷ = 1305490169 is a prime.

It is not a weakly prime, because it can be changed into another prime (1305621221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652810620 + 652810621.

It is an arithmetic number, because the mean of its divisors is an integer number (652810621).

Almost surely, 2^1305621241 is an apocalyptic number.

It is an amenable number.

1305621241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1305621241 is an equidigital number, since it uses as much as digits as its factorization.

1305621241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1305621241 is about 36133.3812561183. The cubic root of 1305621241 is about 1092.9636935696.

Adding to 1305621241 its reverse (1421265031), we get a palindrome (2726886272).

The spelling of 1305621241 in words is "one billion, three hundred five million, six hundred twenty-one thousand, two hundred forty-one".