11409581 has 8 divisors (see below), whose sum is σ = 11844864. Its totient is φ = 10978560.

The previous prime is 11409571. The next prime is 11409583. The reversal of 11409581 is 18590411.

11409581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11409581 - 2¹⁴ = 11393197 is a prime.

It is a super-2 number, since 2×11409581² = 260357077191122, 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 (11409583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5030 + ... + 6936.

It is an arithmetic number, because the mean of its divisors is an integer number (1480608).

Almost surely, 2^11409581 is an apocalyptic number.

It is an amenable number.

11409581 is a deficient number, since it is larger than the sum of its proper divisors (435283).

11409581 is a wasteful number, since it uses less digits than its factorization.

11409581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2131.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 11409581 is about 3377.8071288929. The cubic root of 11409581 is about 225.1247439957.

Adding to 11409581 its reverse (18590411), we get a palindrome (29999992).

The spelling of 11409581 in words is "eleven million, four hundred nine thousand, five hundred eighty-one".