1209742011523 has 2 divisors, whose sum is σ = 1209742011524. Its totient is φ = 1209742011522.

The previous prime is 1209742011497. The next prime is 1209742011559. The reversal of 1209742011523 is 3251102479021.

It is a weak prime.

It is an emirp because it is prime and its reverse (3251102479021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1209742011523 - 2²⁵ = 1209708457091 is a prime.

It is a super-3 number, since 3×1209742011523³ (a number of 37 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1209742011223) 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, 604871005761 + 604871005762.

It is an arithmetic number, because the mean of its divisors is an integer number (604871005762).

Almost surely, 2^{1209742011523} is an apocalyptic number.

1209742011523 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209742011523 is an equidigital number, since it uses as much as digits as its factorization.

1209742011523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 1209742011523 in words is "one trillion, two hundred nine billion, seven hundred forty-two million, eleven thousand, five hundred twenty-three".