1265074321 has 24 divisors (see below), whose sum is σ = 1545457920. Its totient is φ = 1014114816.

The previous prime is 1265074271. The next prime is 1265074339. The reversal of 1265074321 is 1234705621.

It is not a de Polignac number, because 1265074321 - 2⁹ = 1265073809 is a prime.

It is a super-2 number, since 2×1265074321² = 3200826075307222082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1265074351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 196465 + ... + 202801.

It is an arithmetic number, because the mean of its divisors is an integer number (64394080).

Almost surely, 2^1265074321 is an apocalyptic number.

It is an amenable number.

1265074321 is a deficient number, since it is larger than the sum of its proper divisors (280383599).

1265074321 is an equidigital number, since it uses as much as digits as its factorization.

1265074321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6461 (or 6442 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 1265074321 is about 35567.8832797230. The cubic root of 1265074321 is about 1081.5302726900.

Adding to 1265074321 its reverse (1234705621), we get a palindrome (2499779942).

The spelling of 1265074321 in words is "one billion, two hundred sixty-five million, seventy-four thousand, three hundred twenty-one".