11763788521 has 3 divisors (see below), whose sum is σ = 11763896983. Its totient is φ = 11763680060.

The previous prime is 11763788483. The next prime is 11763788591. The reversal of 11763788521 is 12588736711.

The square root of 11763788521 is 108461.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12588736711 = 31 ⋅406088281.

It can be written as a sum of positive squares in only one way, i.e., 1314860121 + 10448928400 = 36261^2 + 102220^2 .

It is a de Polignac number, because none of the positive numbers 2^k-11763788521 is a prime.

It is a super-2 number, since 2×11763788521² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11763788591) 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 in 2 ways as a sum of consecutive naturals, for example, 54231 + ... + 162691.

Almost surely, 2^11763788521 is an apocalyptic number.

11763788521 is the 108461-st square number.

11763788521 is the 54231-st centered octagonal number.

It is an amenable number.

11763788521 is a deficient number, since it is larger than the sum of its proper divisors (108462).

11763788521 is an frugal number, since it uses more digits than its factorization.

11763788521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216922 (or 108461 counting only the distinct ones).

The product of its digits is 564480, while the sum is 49.

Multiplying 11763788521 by its sum of digits (49), we get a square (576425637529 = 759227²).

The spelling of 11763788521 in words is "eleven billion, seven hundred sixty-three million, seven hundred eighty-eight thousand, five hundred twenty-one".