11428581 has 8 divisors (see below), whose sum is σ = 15763680. Its totient is φ = 7356272.

The previous prime is 11428559. The next prime is 11428591. The reversal of 11428581 is 18582411.

It is a happy number.

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 11428581 - 2⁶ = 11428517 is a prime.

It is a super-2 number, since 2×11428581² = 261224927347122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11428511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65595 + ... + 65768.

It is an arithmetic number, because the mean of its divisors is an integer number (1970460).

Almost surely, 2^11428581 is an apocalyptic number.

It is an amenable number.

11428581 is a deficient number, since it is larger than the sum of its proper divisors (4335099).

11428581 is a wasteful number, since it uses less digits than its factorization.

11428581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131395.

The product of its digits is 2560, while the sum is 30.

The square root of 11428581 is about 3380.6184345471. The cubic root of 11428581 is about 225.2496389709.

The spelling of 11428581 in words is "eleven million, four hundred twenty-eight thousand, five hundred eighty-one".