1265321723 has 2 divisors, whose sum is σ = 1265321724. Its totient is φ = 1265321722.

The previous prime is 1265321657. The next prime is 1265321737. The reversal of 1265321723 is 3271235621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1265321723 - 2⁸ = 1265321467 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1265321723.

It is not a weakly prime, because it can be changed into another prime (1265321753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632660861 + 632660862.

It is an arithmetic number, because the mean of its divisors is an integer number (632660862).

Almost surely, 2^1265321723 is an apocalyptic number.

1265321723 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265321723 is an equidigital number, since it uses as much as digits as its factorization.

1265321723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 32.

The square root of 1265321723 is about 35571.3609944854. The cubic root of 1265321723 is about 1081.6007706066.

The spelling of 1265321723 in words is "one billion, two hundred sixty-five million, three hundred twenty-one thousand, seven hundred twenty-three".