11852520781 has 2 divisors, whose sum is σ = 11852520782. Its totient is φ = 11852520780.

The previous prime is 11852520773. The next prime is 11852520809. The reversal of 11852520781 is 18702525811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9558972900 + 2293547881 = 97770^2 + 47891^2 .

It is an emirp because it is prime and its reverse (18702525811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11852520781 - 2³ = 11852520773 is a prime.

It is a super-2 number, since 2×11852520781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11852520181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5926260390 + 5926260391.

It is an arithmetic number, because the mean of its divisors is an integer number (5926260391).

Almost surely, 2^11852520781 is an apocalyptic number.

It is an amenable number.

11852520781 is a deficient number, since it is larger than the sum of its proper divisors (1).

11852520781 is an equidigital number, since it uses as much as digits as its factorization.

11852520781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 44800, while the sum is 40.

The spelling of 11852520781 in words is "eleven billion, eight hundred fifty-two million, five hundred twenty thousand, seven hundred eighty-one".