11523313031521 has 2 divisors, whose sum is σ = 11523313031522. Its totient is φ = 11523313031520.

The previous prime is 11523313031501. The next prime is 11523313031543. The reversal of 11523313031521 is 12513031332511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10358813057121 + 1164499974400 = 3218511^2 + 1079120^2 .

It is a cyclic number.

It is not a de Polignac number, because 11523313031521 - 2¹⁵ = 11523312998753 is a prime.

It is not a weakly prime, because it can be changed into another prime (11523313031501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5761656515760 + 5761656515761.

It is an arithmetic number, because the mean of its divisors is an integer number (5761656515761).

Almost surely, 2^{11523313031521} is an apocalyptic number.

It is an amenable number.

11523313031521 is a deficient number, since it is larger than the sum of its proper divisors (1).

11523313031521 is an equidigital number, since it uses as much as digits as its factorization.

11523313031521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 31.

The spelling of 11523313031521 in words is "eleven trillion, five hundred twenty-three billion, three hundred thirteen million, thirty-one thousand, five hundred twenty-one".