11280581 has 6 divisors (see below), whose sum is σ = 12215250. Its totient is φ = 10412688.

The previous prime is 11280569. The next prime is 11280593. The reversal of 11280581 is 18508211.

It is an interprime number because it is at equal distance from previous prime (11280569) and next prime (11280593).

It can be written as a sum of positive squares in 3 ways, for example, as 58081 + 11222500 = 241^2 + 3350^2 .

It is a de Polignac number, because none of the positive numbers 2^k-11280581 is a prime.

It is a super-2 number, since 2×11280581² = 254503015395122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11280581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11280881) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33206 + ... + 33543.

It is an arithmetic number, because the mean of its divisors is an integer number (2035875).

Almost surely, 2^11280581 is an apocalyptic number.

It is an amenable number.

11280581 is a deficient number, since it is larger than the sum of its proper divisors (934669).

11280581 is an equidigital number, since it uses as much as digits as its factorization.

11280581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66775 (or 66762 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 26.

The square root of 11280581 is about 3358.6576187519. The cubic root of 11280581 is about 224.2730845101.

Adding to 11280581 its reverse (18508211), we get a palindrome (29788792).

The spelling of 11280581 in words is "eleven million, two hundred eighty thousand, five hundred eighty-one".