11187481 has 4 divisors (see below), whose sum is σ = 11196964. Its totient is φ = 11178000.

The previous prime is 11187419. The next prime is 11187503. The reversal of 11187481 is 18478111.

11187481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 18478111 = 421 ⋅43891.

It can be written as a sum of positive squares in 2 ways, for example, as 9272025 + 1915456 = 3045^2 + 1384^2 .

It is a cyclic number.

It is not a de Polignac number, because 11187481 - 2¹⁹ = 10663193 is a prime.

It is a super-2 number, since 2×11187481² = 250319462250722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11187401) 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, 2670 + ... + 5431.

It is an arithmetic number, because the mean of its divisors is an integer number (2799241).

Almost surely, 2^11187481 is an apocalyptic number.

It is an amenable number.

11187481 is a deficient number, since it is larger than the sum of its proper divisors (9483).

11187481 is an equidigital number, since it uses as much as digits as its factorization.

11187481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9482.

The product of its digits is 1792, while the sum is 31.

The square root of 11187481 is about 3344.7691998104. The cubic root of 11187481 is about 223.6543950343.

The spelling of 11187481 in words is "eleven million, one hundred eighty-seven thousand, four hundred eighty-one".