1264012643 has 2 divisors, whose sum is σ = 1264012644. Its totient is φ = 1264012642.

The previous prime is 1264012619. The next prime is 1264012661. The reversal of 1264012643 is 3462104621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1264012643 - 2⁶ = 1264012579 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1264012613) 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, 632006321 + 632006322.

It is an arithmetic number, because the mean of its divisors is an integer number (632006322).

Almost surely, 2^1264012643 is an apocalyptic number.

1264012643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264012643 is an equidigital number, since it uses as much as digits as its factorization.

1264012643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 1264012643 is about 35552.9554748969. The cubic root of 1264012643 is about 1081.2276400735.

The spelling of 1264012643 in words is "one billion, two hundred sixty-four million, twelve thousand, six hundred forty-three".