1305243255523 has 16 divisors (see below), whose sum is σ = 1324296933376. Its totient is φ = 1286350359840.

The previous prime is 1305243255517. The next prime is 1305243255529. The reversal of 1305243255523 is 3255523425031.

It is an interprime number because it is at equal distance from previous prime (1305243255517) and next prime (1305243255529).

It is a cyclic number.

It is not a de Polignac number, because 1305243255523 - 2²¹ = 1305241158371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1305243255529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13968265 + ... + 14061397.

It is an arithmetic number, because the mean of its divisors is an integer number (82768558336).

Almost surely, 2^{1305243255523} is an apocalyptic number.

1305243255523 is a deficient number, since it is larger than the sum of its proper divisors (19053677853).

1305243255523 is a wasteful number, since it uses less digits than its factorization.

1305243255523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93994.

The product of its (nonzero) digits is 540000, while the sum is 40.

The spelling of 1305243255523 in words is "one trillion, three hundred five billion, two hundred forty-three million, two hundred fifty-five thousand, five hundred twenty-three".