1264221241 has 2 divisors, whose sum is σ = 1264221242. Its totient is φ = 1264221240.

The previous prime is 1264221193. The next prime is 1264221307. The reversal of 1264221241 is 1421224621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1224720016 + 39501225 = 34996^2 + 6285^2 .

It is a cyclic number.

It is not a de Polignac number, because 1264221241 - 2¹⁷ = 1264090169 is a prime.

It is not a weakly prime, because it can be changed into another prime (1264221941) 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, 632110620 + 632110621.

It is an arithmetic number, because the mean of its divisors is an integer number (632110621).

Almost surely, 2^1264221241 is an apocalyptic number.

It is an amenable number.

1264221241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264221241 is an equidigital number, since it uses as much as digits as its factorization.

1264221241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536, while the sum is 25.

The square root of 1264221241 is about 35555.8889777769. Note that the first 3 decimals coincide. The cubic root of 1264221241 is about 1081.2871145624.

Adding to 1264221241 its reverse (1421224621), we get a palindrome (2685445862).

The spelling of 1264221241 in words is "one billion, two hundred sixty-four million, two hundred twenty-one thousand, two hundred forty-one".