1264221265 has 12 divisors (see below), whose sum is σ = 1554979932. Its totient is φ = 986702720.

The previous prime is 1264221241. The next prime is 1264221307. The reversal of 1264221265 is 5621224621.

It can be written as a sum of positive squares in 6 ways, for example, as 206410689 + 1057810576 = 14367^2 + 32524^2 .

It is not a de Polignac number, because 1264221265 - 2⁹ = 1264220753 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66802 + ... + 83611.

It is an arithmetic number, because the mean of its divisors is an integer number (129581661).

Almost surely, 2^1264221265 is an apocalyptic number.

It is an amenable number.

1264221265 is a deficient number, since it is larger than the sum of its proper divisors (290758667).

1264221265 is an equidigital number, since it uses as much as digits as its factorization.

1264221265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150500 (or 150459 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 1264221265 is about 35555.8893152738. The cubic root of 1264221265 is about 1081.2871214048.

Adding to 1264221265 its reverse (5621224621), we get a palindrome (6885445886).

The spelling of 1264221265 in words is "one billion, two hundred sixty-four million, two hundred twenty-one thousand, two hundred sixty-five".