11543012521 has 2 divisors, whose sum is σ = 11543012522. Its totient is φ = 11543012520.

The previous prime is 11543012501. The next prime is 11543012527. The reversal of 11543012521 is 12521034511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11539056400 + 3956121 = 107420^2 + 1989^2 .

It is an emirp because it is prime and its reverse (12521034511) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11543012521 is a prime.

It is a super-2 number, since 2×11543012521² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11543012527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5771506260 + 5771506261.

It is an arithmetic number, because the mean of its divisors is an integer number (5771506261).

Almost surely, 2^11543012521 is an apocalyptic number.

It is an amenable number.

11543012521 is a deficient number, since it is larger than the sum of its proper divisors (1).

11543012521 is an equidigital number, since it uses as much as digits as its factorization.

11543012521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 25.

The spelling of 11543012521 in words is "eleven billion, five hundred forty-three million, twelve thousand, five hundred twenty-one".