11552530621 has 2 divisors, whose sum is σ = 11552530622. Its totient is φ = 11552530620.

The previous prime is 11552530603. The next prime is 11552530637. The reversal of 11552530621 is 12603525511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9679804996 + 1872725625 = 98386^2 + 43275^2 .

It is an emirp because it is prime and its reverse (12603525511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11552530621 - 2¹⁷ = 11552399549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11552530721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5776265310 + 5776265311.

It is an arithmetic number, because the mean of its divisors is an integer number (5776265311).

Almost surely, 2^11552530621 is an apocalyptic number.

It is an amenable number.

11552530621 is a deficient number, since it is larger than the sum of its proper divisors (1).

11552530621 is an equidigital number, since it uses as much as digits as its factorization.

11552530621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9000, while the sum is 31.

The spelling of 11552530621 in words is "eleven billion, five hundred fifty-two million, five hundred thirty thousand, six hundred twenty-one".