11187925481 has 2 divisors, whose sum is σ = 11187925482. Its totient is φ = 11187925480.

The previous prime is 11187925423. The next prime is 11187925487. The reversal of 11187925481 is 18452978111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10258651225 + 929274256 = 101285^2 + 30484^2 .

It is an emirp because it is prime and its reverse (18452978111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11187925481 - 2²⁶ = 11120816617 is a prime.

It is a super-2 number, since 2×11187925481² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (11187925487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5593962740 + 5593962741.

It is an arithmetic number, because the mean of its divisors is an integer number (5593962741).

Almost surely, 2^11187925481 is an apocalyptic number.

It is an amenable number.

11187925481 is a deficient number, since it is larger than the sum of its proper divisors (1).

11187925481 is an equidigital number, since it uses as much as digits as its factorization.

11187925481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 47.

The spelling of 11187925481 in words is "eleven billion, one hundred eighty-seven million, nine hundred twenty-five thousand, four hundred eighty-one".