11411581 has 4 divisors (see below), whose sum is σ = 11426464. Its totient is φ = 11396700.

The previous prime is 11411563. The next prime is 11411597. The reversal of 11411581 is 18511411.

11411581 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 Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11411581 - 2¹³ = 11403389 is a prime.

It is a super-2 number, since 2×11411581² = 260448361839122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11411501) 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, 6225 + ... + 7846.

It is an arithmetic number, because the mean of its divisors is an integer number (2856616).

Almost surely, 2^11411581 is an apocalyptic number.

11411581 is the 2137-th centered pentagonal number.

It is an amenable number.

11411581 is a deficient number, since it is larger than the sum of its proper divisors (14883).

11411581 is an equidigital number, since it uses as much as digits as its factorization.

11411581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14882.

The product of its digits is 160, while the sum is 22.

The square root of 11411581 is about 3378.1031659794. The cubic root of 11411581 is about 225.1378973616.

Adding to 11411581 its reverse (18511411), we get a palindrome (29922992).

The spelling of 11411581 in words is "eleven million, four hundred eleven thousand, five hundred eighty-one".