11405541 has 16 divisors (see below), whose sum is σ = 17432064. Its totient is φ = 6497904.

The previous prime is 11405533. The next prime is 11405549. The reversal of 11405541 is 14550411.

It is an interprime number because it is at equal distance from previous prime (11405533) and next prime (11405549).

It is not a de Polignac number, because 11405541 - 2³ = 11405533 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11405549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9226 + ... + 10388.

It is an arithmetic number, because the mean of its divisors is an integer number (1089504).

Almost surely, 2^11405541 is an apocalyptic number.

It is an amenable number.

11405541 is a deficient number, since it is larger than the sum of its proper divisors (6026523).

11405541 is a wasteful number, since it uses less digits than its factorization.

11405541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 11405541 is about 3377.2090548262. The cubic root of 11405541 is about 225.0981695072.

Adding to 11405541 its reverse (14550411), we get a palindrome (25955952).

The spelling of 11405541 in words is "eleven million, four hundred five thousand, five hundred forty-one".