11185487251 has 4 divisors (see below), whose sum is σ = 11185698832. Its totient is φ = 11185275672.

The previous prime is 11185487233. The next prime is 11185487293. The reversal of 11185487251 is 15278458111.

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.

It is a cyclic number.

It is not a de Polignac number, because 11185487251 - 2⁵ = 11185487219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11185487198 and 11185487207.

It is not an unprimeable number, because it can be changed into a prime (11185487851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49210 + ... + 157456.

It is an arithmetic number, because the mean of its divisors is an integer number (2796424708).

Almost surely, 2^11185487251 is an apocalyptic number.

11185487251 is a deficient number, since it is larger than the sum of its proper divisors (211581).

11185487251 is a wasteful number, since it uses less digits than its factorization.

11185487251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211580.

The product of its digits is 89600, while the sum is 43.

It can be divided in two parts, 11185 and 487251, that added together give a square (498436 = 706²).

The spelling of 11185487251 in words is "eleven billion, one hundred eighty-five million, four hundred eighty-seven thousand, two hundred fifty-one".