11405131 has 4 divisors (see below), whose sum is σ = 11413672. Its totient is φ = 11396592.

The previous prime is 11405129. The next prime is 11405137. The reversal of 11405131 is 13150411.

11405131 is digitally balanced in base 2 and base 3, because in such bases 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.

It is a cyclic number.

It is not a de Polignac number, because 11405131 - 2¹ = 11405129 is a prime.

It is a super-2 number, since 2×11405131² = 260154026254322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11405137) 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, 1785 + ... + 5098.

It is an arithmetic number, because the mean of its divisors is an integer number (2853418).

Almost surely, 2^11405131 is an apocalyptic number.

11405131 is a deficient number, since it is larger than the sum of its proper divisors (8541).

11405131 is an equidigital number, since it uses as much as digits as its factorization.

11405131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8540.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 11405131 is about 3377.1483532708. The cubic root of 11405131 is about 225.0954722406.

Adding to 11405131 its reverse (13150411), we get a palindrome (24555542).

The spelling of 11405131 in words is "eleven million, four hundred five thousand, one hundred thirty-one".